-15=f/10-21

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Solution for -15=f/10-21 equation: 



-15=f/10-21

We move all terms to the left:

-15-(f/10-21)=0

We get rid of parentheses

-f/10+21-15=0

We multiply all the terms by the denominator


-f+21*10-15*10=0

We add all the numbers together, and all the variables

-1f+60=0

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

-f=-60

f=-60/-1

f=+60

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