-13=f+-1

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Solution for -13=f+-1 equation: 



-13=f+-1

We move all terms to the left:

-13-(f+-1)=0

We add all the numbers together, and all the variables

-(f-1)-13=0

We get rid of parentheses

-f+1-13=0

We add all the numbers together, and all the variables

-1f-12=0

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

-f=12

f=12/-1

f=-12

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