f+15=3f+7

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



f+15=3f+7

We move all terms to the left:

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

We get rid of parentheses

f-3f-7+15=0

We add all the numbers together, and all the variables

-2f+8=0

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

-2f=-8

f=-8/-2

f=+4

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