145 - 5.(x + 1) = 41 - 3. (1+x)

$145\:-\:5\cdot \left(x\:+\:1\right)\:=\:41\:-\:3\cdot \left(1+x\right)$

$⇒5x+140=-3x+38$

$⇒-5x+140-140=-3x+38-140$

$⇒-5x=-3x-102$

$⇒-5x+3x=-3x-102+3x$

$⇒-2x=-102$

$⇒-2x=(-102):(-2)$

$⇒x=51$

`Vậy` $x=51$

Đáp án:

 `x=51`

Giải thích các bước giải:

`145 - 5.(x + 1) = 41 - 3. (1+x)`

`5.(x+1)=145-[41-3.(x+1)]`

`5.(x + 1)=145-41+3.(x+1)`

`5 .(x + 1)=104+ 3.(x+1)`

`5 .(x + 1)-3.(x+1)=104`

`(5-3)(x+1)=104`

`2.(x+1)=104`

`x+1=104:2`

`x+1=52`

`x=52-1`

`x=51`

vậy `x=51`

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