20+17-6f=-20-9f

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Solution for 20+17-6f=-20-9f equation: 



20+17-6f=-20-9f

We move all terms to the left:

20+17-6f-(-20-9f)=0

We add all the numbers together, and all the variables

-6f-(-9f-20)+20+17=0

We add all the numbers together, and all the variables

-6f-(-9f-20)+37=0

We get rid of parentheses

-6f+9f+20+37=0

We add all the numbers together, and all the variables

3f+57=0

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

3f=-57

f=-57/3

f=-19

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