Tìm `x` `a)-3x-3/4=6/5` `b)1/7-3/5x=3/5` `c)3/7-1/2x=5/3` `d)-2/3x+2=3/4`

Đáp án`+`Giải thích các bước giải:

` a) -3x - 3/4 = 6/5 `

` -3x = 6/5 + 3/4 `

` -3x = 39/20 `

` x = 39/20 : (-3) `

` x = -13/20 `

Vậy: ` x = -13/20 `

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` b) 1/7 - 3/5x = 3/5 `

` 3/5x = 1/7 - 3/5 `

` 3/5x = -16/35 `

` x = (-16/35) : 3/5 `

` x = -16/21 `

Vậy: ` x = -16/21 `

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` c) 3/7 - 1/2x = 5/3 `

` 1/2x = 3/7 - 5/3 `

` 1/2x = -26/21 `

` x = (-26/21) : 1/2 `

` x = -52/21 `

Vậy: ` x = -52/21 `

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` d) -2/3x + 2 = 3/4 `

` -2/3x = 3/4 - 2 `

` -2/3x = -5/4 `

` x = (-5/4) : (-2/3) `

` x = 15/8 `

Vậy: ` x = 15/8 `

$@A$