-1a+15=13

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Solution for -1a+15=13 equation: 



-1a+15=13

We move all terms to the left:

-1a+15-(13)=0

We add all the numbers together, and all the variables

-1a+2=0

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

-a=-2

a=-2/-1

a=+2

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