6a+15+a=78

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Solution for 6a+15+a=78 equation: 



6a+15+a=78

We move all terms to the left:

6a+15+a-(78)=0

We add all the numbers together, and all the variables

7a-63=0

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

7a=63

a=63/7

a=9

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