-(x+1)=3x+7

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Solution for -(x+1)=3x+7 equation: 



-(x+1)=3x+7

We move all terms to the left:

-(x+1)-(3x+7)=0

We get rid of parentheses

-x-3x-1-7=0

We add all the numbers together, and all the variables

-4x-8=0

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

-4x=8

x=8/-4

x=-2

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