9a+12-5a=-72

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Solution for 9a+12-5a=-72 equation: 



9a+12-5a=-72

We move all terms to the left:

9a+12-5a-(-72)=0

We add all the numbers together, and all the variables

4a+84=0

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

4a=-84

a=-84/4

a=-21

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