-90=6x+2(-5x-21)

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Solution for -90=6x+2(-5x-21) equation: 



-90=6x+2(-5x-21)

We move all terms to the left:

-90-(6x+2(-5x-21))=0



We calculate terms in parentheses: -(6x+2(-5x-21)), so:

6x+2(-5x-21)

We multiply parentheses

6x-10x-42

We add all the numbers together, and all the variables

-4x-42

Back to the equation:

-(-4x-42)



We get rid of parentheses

4x+42-90=0

We add all the numbers together, and all the variables

4x-48=0

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

4x=48

x=48/4

x=12

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