15=3+4a

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Solution for 15=3+4a equation: 



15=3+4a

We move all terms to the left:

15-(3+4a)=0

We add all the numbers together, and all the variables

-(4a+3)+15=0

We get rid of parentheses

-4a-3+15=0

We add all the numbers together, and all the variables

-4a+12=0

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

-4a=-12

a=-12/-4

a=+3

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