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14=-7f-9
We move all terms to the left:
14-(-7f-9)=0
We get rid of parentheses
7f+9+14=0
We add all the numbers together, and all the variables
7f+23=0
We move all terms containing f to the left, all other terms to the right
7f=-23
f=-23/7
f=-3+2/7
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