-30=-3x-2(-2x+21)

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Solution for -30=-3x-2(-2x+21) equation: 



-30=-3x-2(-2x+21)

We move all terms to the left:

-30-(-3x-2(-2x+21))=0



We calculate terms in parentheses: -(-3x-2(-2x+21)), so:

-3x-2(-2x+21)

We multiply parentheses

-3x+4x-42

We add all the numbers together, and all the variables

x-42

Back to the equation:

-(x-42)



We get rid of parentheses

-x+42-30=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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