12f+49=31f-84

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Solution for 12f+49=31f-84 equation: 



12f+49=31f-84

We move all terms to the left:

12f+49-(31f-84)=0

We get rid of parentheses

12f-31f+84+49=0

We add all the numbers together, and all the variables

-19f+133=0

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

-19f=-133

f=-133/-19

f=+7

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