20=-9f+7f

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Solution for 20=-9f+7f equation: 



20=-9f+7f

We move all terms to the left:

20-(-9f+7f)=0

We add all the numbers together, and all the variables

-(-2f)+20=0

We get rid of parentheses

2f+20=0

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

2f=-20

f=-20/2

f=-10

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