3=15-a

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Solution for 3=15-a equation: 



3=15-a

We move all terms to the left:

3-(15-a)=0

We add all the numbers together, and all the variables

-(-1a+15)+3=0

We get rid of parentheses

1a-15+3=0

We add all the numbers together, and all the variables

a-12=0

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

a=12

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