a=15-4a

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Solution for a=15-4a equation: 



a=15-4a

We move all terms to the left:

a-(15-4a)=0

We add all the numbers together, and all the variables

a-(-4a+15)=0

We get rid of parentheses

a+4a-15=0

We add all the numbers together, and all the variables

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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