9=-15+f/4

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Solution for 9=-15+f/4 equation: 



9=-15+f/4

We move all terms to the left:

9-(-15+f/4)=0

We add all the numbers together, and all the variables

-(f/4-15)+9=0

We get rid of parentheses

-f/4+15+9=0

We multiply all the terms by the denominator


-f+15*4+9*4=0

We add all the numbers together, and all the variables

-1f+96=0

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

-f=-96

f=-96/-1

f=+96

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