21a+15a+30=108

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Solution for 21a+15a+30=108 equation: 



21a+15a+30=108

We move all terms to the left:

21a+15a+30-(108)=0

We add all the numbers together, and all the variables

36a-78=0

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

36a=78

a=78/36

a=2+1/6

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