4f+10=9f-20

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Solution for 4f+10=9f-20 equation: 



4f+10=9f-20

We move all terms to the left:

4f+10-(9f-20)=0

We get rid of parentheses

4f-9f+20+10=0

We add all the numbers together, and all the variables

-5f+30=0

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

-5f=-30

f=-30/-5

f=+6

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