12-9a=-3(a+10)

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Solution for 12-9a=-3(a+10) equation: 



12-9a=-3(a+10)

We move all terms to the left:

12-9a-(-3(a+10))=0



We calculate terms in parentheses: -(-3(a+10)), so:

-3(a+10)

We multiply parentheses

-3a-30

Back to the equation:

-(-3a-30)



We get rid of parentheses

-9a+3a+30+12=0

We add all the numbers together, and all the variables

-6a+42=0

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

-6a=-42

a=-42/-6

a=+7

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