-30=-2(-a+3)

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



-30=-2(-a+3)

We move all terms to the left:

-30-(-2(-a+3))=0

We add all the numbers together, and all the variables

-(-2(-1a+3))-30=0



We calculate terms in parentheses: -(-2(-1a+3)), so:

-2(-1a+3)

We multiply parentheses

2a-6

Back to the equation:

-(2a-6)



We get rid of parentheses

-2a+6-30=0

We add all the numbers together, and all the variables

-2a-24=0

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

-2a=24

a=24/-2

a=-12

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