-15=8x-21-5x

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Solution for -15=8x-21-5x equation: 



-15=8x-21-5x

We move all terms to the left:

-15-(8x-21-5x)=0

We add all the numbers together, and all the variables

-(3x-21)-15=0

We get rid of parentheses

-3x+21-15=0

We add all the numbers together, and all the variables

-3x+6=0

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

-3x=-6

x=-6/-3

x=+2

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