13-a=15-8

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Solution for 13-a=15-8 equation: 



13-a=15-8

We move all terms to the left:

13-a-(15-8)=0

We add all the numbers together, and all the variables

-a+13-7=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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