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12=5f+2
We move all terms to the left:
12-(5f+2)=0
We get rid of parentheses
-5f-2+12=0
We add all the numbers together, and all the variables
-5f+10=0
We move all terms containing f to the left, all other terms to the right
-5f=-10
f=-10/-5
f=+2
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