12-(-75)=a

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Solution for 12-(-75)=a equation: 



12-(-75)=a

We move all terms to the left:

12-(-75)-(a)=0

We add all the numbers together, and all the variables

-1a+87=0

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

-a=-87

a=-87/-1

a=+87

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