39=15-2a

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Solution for 39=15-2a equation: 



39=15-2a

We move all terms to the left:

39-(15-2a)=0

We add all the numbers together, and all the variables

-(-2a+15)+39=0

We get rid of parentheses

2a-15+39=0

We add all the numbers together, and all the variables

2a+24=0

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

2a=-24

a=-24/2

a=-12

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