9a+15-6a+12=90

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Solution for 9a+15-6a+12=90 equation: 



9a+15-6a+12=90

We move all terms to the left:

9a+15-6a+12-(90)=0

We add all the numbers together, and all the variables

3a-63=0

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

3a=63

a=63/3

a=21

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