a+3a=15

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Solution for a+3a=15 equation: 



a+3a=15

We move all terms to the left:

a+3a-(15)=0

We add all the numbers together, and all the variables

4a-15=0

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

4a=15

a=15/4

a=3+3/4

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