15=a-57

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Solution for 15=a-57 equation: 



15=a-57

We move all terms to the left:

15-(a-57)=0

We get rid of parentheses

-a+57+15=0

We add all the numbers together, and all the variables

-1a+72=0

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

-a=-72

a=-72/-1

a=+72

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