-4f=20-9f

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Solution for -4f=20-9f equation: 



-4f=20-9f

We move all terms to the left:

-4f-(20-9f)=0

We add all the numbers together, and all the variables

-4f-(-9f+20)=0

We get rid of parentheses

-4f+9f-20=0

We add all the numbers together, and all the variables

5f-20=0

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

5f=20

f=20/5

f=4

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