12=f+7

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Solution for 12=f+7 equation: 



12=f+7

We move all terms to the left:

12-(f+7)=0

We get rid of parentheses

-f-7+12=0

We add all the numbers together, and all the variables

-1f+5=0

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

-f=-5

f=-5/-1

f=+5

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