-13=3+7x+5

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Solution for -13=3+7x+5 equation: 



-13=3+7x+5

We move all terms to the left:

-13-(3+7x+5)=0

We add all the numbers together, and all the variables

-(7x+8)-13=0

We get rid of parentheses

-7x-8-13=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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