-3x=x-40

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Solution for -3x=x-40 equation: 



-3x=x-40

We move all terms to the left:

-3x-(x-40)=0

We get rid of parentheses

-3x-x+40=0

We add all the numbers together, and all the variables

-4x+40=0

We move all terms containing x to the left, all other terms to the right

-4x=-40

x=-40/-4

x=+10

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