15=a+-2

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Solution for 15=a+-2 equation: 



15=a+-2

We move all terms to the left:

15-(a+-2)=0

We add all the numbers together, and all the variables

-(a-2)+15=0

We get rid of parentheses

-a+2+15=0

We add all the numbers together, and all the variables

-1a+17=0

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

-a=-17

a=-17/-1

a=+17

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