-20=8x-5+7x

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



-20=8x-5+7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(15x-5)-20=0

We get rid of parentheses

-15x+5-20=0

We add all the numbers together, and all the variables

-15x-15=0

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

-15x=15

x=15/-15

x=-1

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