-3x-12=4x-40

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Solution for -3x-12=4x-40 equation: 



-3x-12=4x-40

We move all terms to the left:

-3x-12-(4x-40)=0

We get rid of parentheses

-3x-4x+40-12=0

We add all the numbers together, and all the variables

-7x+28=0

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

-7x=-28

x=-28/-7

x=+4

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