15=-9f+7f

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Solution for 15=-9f+7f equation: 



15=-9f+7f

We move all terms to the left:

15-(-9f+7f)=0

We add all the numbers together, and all the variables

-(-2f)+15=0

We get rid of parentheses

2f+15=0

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

2f=-15

f=-15/2

f=-7+1/2

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