15=2a+3a

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Solution for 15=2a+3a equation: 



15=2a+3a

We move all terms to the left:

15-(2a+3a)=0

We add all the numbers together, and all the variables

-(+5a)+15=0

We get rid of parentheses

-5a+15=0

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

-5a=-15

a=-15/-5

a=+3

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