-20=5x-7+8x

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Solution for -20=5x-7+8x equation: 



-20=5x-7+8x

We move all terms to the left:

-20-(5x-7+8x)=0

We add all the numbers together, and all the variables

-(13x-7)-20=0

We get rid of parentheses

-13x+7-20=0

We add all the numbers together, and all the variables

-13x-13=0

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

-13x=13

x=13/-13

x=-1

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