-13=f-7

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Solution for -13=f-7 equation: 



-13=f-7

We move all terms to the left:

-13-(f-7)=0

We get rid of parentheses

-f+7-13=0

We add all the numbers together, and all the variables

-1f-6=0

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

-f=6

f=6/-1

f=-6

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