15-(-86)=a

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Solution for 15-(-86)=a equation: 



15-(-86)=a

We move all terms to the left:

15-(-86)-(a)=0

We add all the numbers together, and all the variables

-1a+101=0

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

-a=-101

a=-101/-1

a=+101

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