-13=7+7x

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Solution for -13=7+7x equation: 



-13=7+7x

We move all terms to the left:

-13-(7+7x)=0

We add all the numbers together, and all the variables

-(7x+7)-13=0

We get rid of parentheses

-7x-7-13=0

We add all the numbers together, and all the variables

-7x-20=0

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

-7x=20

x=20/-7

x=-2+6/7

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