15+17f=20f-9

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Solution for 15+17f=20f-9 equation: 



15+17f=20f-9

We move all terms to the left:

15+17f-(20f-9)=0

We get rid of parentheses

17f-20f+9+15=0

We add all the numbers together, and all the variables

-3f+24=0

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

-3f=-24

f=-24/-3

f=+8

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