72=-9a-9a

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Solution for 72=-9a-9a equation: 



72=-9a-9a

We move all terms to the left:

72-(-9a-9a)=0

We add all the numbers together, and all the variables

-(-18a)+72=0

We get rid of parentheses

18a+72=0

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

18a=-72

a=-72/18

a=-4

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