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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