27=a-15

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Solution for 27=a-15 equation: 



27=a-15

We move all terms to the left:

27-(a-15)=0

We get rid of parentheses

-a+15+27=0

We add all the numbers together, and all the variables

-1a+42=0

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

-a=-42

a=-42/-1

a=+42

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