a-5+3a=15

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Solution for a-5+3a=15 equation: 



a-5+3a=15

We move all terms to the left:

a-5+3a-(15)=0

We add all the numbers together, and all the variables

4a-20=0

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

4a=20

a=20/4

a=5

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