3a+12a=60

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Solution for 3a+12a=60 equation: 



3a+12a=60

We move all terms to the left:

3a+12a-(60)=0

We add all the numbers together, and all the variables

15a-60=0

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

15a=60

a=60/15

a=4

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