-x-4=3x-40

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



-x-4=3x-40

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x-(3x-40)-4=0

We get rid of parentheses

-1x-3x+40-4=0

We add all the numbers together, and all the variables

-4x+36=0

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

-4x=-36

x=-36/-4

x=+9

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