Giải giúp mình với cần gấp!!!

Đáp án `+` Giải thích các bước giải:

`a,` `2(x - 3) - 4 = 16`

`2(x - 3) = 20`

`x - 3 = 10`

`x = 13`

Vậy `x = 13`

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`b,` `1975 + (x + 5) : 5 = 2020`

`(x + 5) : 5 = 45`

`x + 5 = 225`

`x = 220`

Vậy `x = 220`

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`c,` `103 - 3(x - 4) = 100`

`3(x - 4) = 3`

`x - 4 = 1`

`x = 5`

Vậy `x = 5`

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`d,` `(x - 4)(2x - 6) = 0`

Ta xét các TH sau:

TH1: `x - 4 = 0`

`x = 4`

TH2: `2x - 6 = 0`

`2x = 6`

`x = 3`

Vậy `x \in {4;3}`

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`e,` `(3x - 15)(2x - 2) = 0`

Ta xét các TH sau:

TH1: `3x - 15 = 0`

`3x = 15`

`x = 5`

TH2: `2x - 2 = 0`

`2x = 2`

`x = 1`

Vậy `x \in {5;1}`

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`f,` `(x - 47) - 115 = 0`

`x - 47 = 115`

`x = 162`

Vậy `x = 162`

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`g,` `3(x - 50) - 7 = 8`

`3(x - 50) = 15`

`x - 50 = 5`

`x = 55`

Vậy `x = 55`

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`h,` `221 - 2(x + 3) = 203`

`2(x + 3) = 18`

`x + 3 = 9`

`x = 6`

Vậy `x = 6`

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`i,` `5x - 46 : 23 = 18`

`5x - 2 = 18`

`5x = 20`

`x = 4`

Vậy `x = 4`

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`k,` `315 + (146 - x) = 401`

`146 - x = 86`

`x = 60`

Vậy `x = 60`

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`t,` `70 - 5(x - 3) = 45`

`5(x - 3) = 35`

`x - 3 = 7`

`x = 10`

Vậy `x = 10`

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`u,` `123 - 5(x - 2) = 28`

`5(x - 2) = 95`

`x - 2 = 19`

`x = 21`

Vậy `x = 21`

                                                 `color{#CC33FF}{K}color{#CC33CC}{a}color{#CC3399}{m}color{#CC3366}{a}color{#993366}{d}color{#993399}{o}` `color{#9933CC}{N}color{#9933FF}{e}color{#6633FF}{z}color{#6633CC}{u}color{#663399}{k}color{#663366}{o}` `color{#333366}{c}color{#333399}{u}color{#3333CC}{t}color{#3333FF}{e}`