12-4f=-2f-18

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Solution for 12-4f=-2f-18 equation: 



12-4f=-2f-18

We move all terms to the left:

12-4f-(-2f-18)=0

We get rid of parentheses

-4f+2f+18+12=0

We add all the numbers together, and all the variables

-2f+30=0

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

-2f=-30

f=-30/-2

f=+15

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