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Đáp án+Giải thích các bước giải:

 `a) 5×(4+6×x) = 290`

`<=> (4+6×x) = 290 : 5`

`<=> 4+6×x = 58`

`<=> 6×x = 54`

`<=> x = 9`

Vậy `x=9`

`b) x ×3,7 + x ×6,3 = 120`

`<=> x×(3,7+6,3) = 120`

`<=> x × 10 = 120`

`<=> x = 12`

Vậy `x=12`

`c) (15×24-x) : 0,25 = 100 : 1/4`

`<=> 360 -x = 100 : 1/4 × 0,25`

`<=> 360 - x = 100`

`<=> x = 360 - 100`

`<=> x = 260`

Vậy `x=260`

`d) 128 ×x - 12×x - 16×x = 5208000`

`<=> x ×(128-12 - 16) = 5208000`

`<=> x × 100 = 5208000`

`<=> x = 52080`

Vậy `x=52080`

`e) 5×x+3,75×x+1,25×x=20`

`<=> x×(5+3,75+1,25) = 20`

`<=> x ×10=20`

`<=> x = 2`

Vậy `x=2`

`g) (84,6-2×x) : 3,02 = 5,1`

`<=> 84,6-2×x = 5,1×3,02`

`<=> 84,6-2×x = 15.402`

`<=> 2×x = 84,6 - 15,402`

`<=> 2×x = 69,198`

`<=> x = 34,599`

Vậy `x=34,599`