13=a-4

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Solution for 13=a-4 equation: 



13=a-4

We move all terms to the left:

13-(a-4)=0

We get rid of parentheses

-a+4+13=0

We add all the numbers together, and all the variables

-1a+17=0

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

-a=-17

a=-17/-1

a=+17

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