5a+12+9a-12=90

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Solution for 5a+12+9a-12=90 equation: 



5a+12+9a-12=90

We move all terms to the left:

5a+12+9a-12-(90)=0

We add all the numbers together, and all the variables

14a-90=0

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

14a=90

a=90/14

a=6+3/7

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