f+12=3f-30

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Solution for f+12=3f-30 equation: 



f+12=3f-30

We move all terms to the left:

f+12-(3f-30)=0

We get rid of parentheses

f-3f+30+12=0

We add all the numbers together, and all the variables

-2f+42=0

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

-2f=-42

f=-42/-2

f=+21

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