13a+2a=120

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Solution for 13a+2a=120 equation: 



13a+2a=120

We move all terms to the left:

13a+2a-(120)=0

We add all the numbers together, and all the variables

15a-120=0

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

15a=120

a=120/15

a=8

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