15+9a=78

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Solution for 15+9a=78 equation: 



15+9a=78

We move all terms to the left:

15+9a-(78)=0

We add all the numbers together, and all the variables

9a-63=0

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

9a=63

a=63/9

a=7

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