3f+7=5f-15

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Solution for 3f+7=5f-15 equation: 



3f+7=5f-15

We move all terms to the left:

3f+7-(5f-15)=0

We get rid of parentheses

3f-5f+15+7=0

We add all the numbers together, and all the variables

-2f+22=0

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

-2f=-22

f=-22/-2

f=+11

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