-12=a-13

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Solution for -12=a-13 equation: 



-12=a-13

We move all terms to the left:

-12-(a-13)=0

We get rid of parentheses

-a+13-12=0

We add all the numbers together, and all the variables

-1a+1=0

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

-a=-1

a=-1/-1

a=1

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