3f+19=5f-21

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Solution for 3f+19=5f-21 equation: 



3f+19=5f-21

We move all terms to the left:

3f+19-(5f-21)=0

We get rid of parentheses

3f-5f+21+19=0

We add all the numbers together, and all the variables

-2f+40=0

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

-2f=-40

f=-40/-2

f=+20

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