-13-(-7)=a

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Solution for -13-(-7)=a equation: 



-13-(-7)=a

We move all terms to the left:

-13-(-7)-(a)=0

We add all the numbers together, and all the variables

-1a-6=0

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

-a=6

a=6/-1

a=-6

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