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-3+4f=-12+3f
We move all terms to the left:
-3+4f-(-12+3f)=0
We add all the numbers together, and all the variables
4f-(3f-12)-3=0
We get rid of parentheses
4f-3f+12-3=0
We add all the numbers together, and all the variables
f+9=0
We move all terms containing f to the left, all other terms to the right
f=-9
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