15=4a-a

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Solution for 15=4a-a equation: 



15=4a-a

We move all terms to the left:

15-(4a-a)=0

We add all the numbers together, and all the variables

-(+3a)+15=0

We get rid of parentheses

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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