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6f-9-4=-6f+12
We move all terms to the left:
6f-9-4-(-6f+12)=0
We add all the numbers together, and all the variables
6f-(-6f+12)-13=0
We get rid of parentheses
6f+6f-12-13=0
We add all the numbers together, and all the variables
12f-25=0
We move all terms containing f to the left, all other terms to the right
12f=25
f=25/12
f=2+1/12
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