-6=15-f

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Solution for -6=15-f equation: 



-6=15-f

We move all terms to the left:

-6-(15-f)=0

We add all the numbers together, and all the variables

-(-1f+15)-6=0

We get rid of parentheses

1f-15-6=0

We add all the numbers together, and all the variables

f-21=0

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

f=21

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