7-(x+1)=-3x

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



7-(x+1)=-3x

We move all terms to the left:

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

We get rid of parentheses

-x+3x-1+7=0

We add all the numbers together, and all the variables

2x+6=0

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

2x=-6

x=-6/2

x=-3

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