-21=5+5x+8x

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Solution for -21=5+5x+8x equation: 



-21=5+5x+8x

We move all terms to the left:

-21-(5+5x+8x)=0

We add all the numbers together, and all the variables

-(13x+5)-21=0

We get rid of parentheses

-13x-5-21=0

We add all the numbers together, and all the variables

-13x-26=0

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

-13x=26

x=26/-13

x=-2

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