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35=4f-15
We move all terms to the left:
35-(4f-15)=0
We get rid of parentheses
-4f+15+35=0
We add all the numbers together, and all the variables
-4f+50=0
We move all terms containing f to the left, all other terms to the right
-4f=-50
f=-50/-4
f=12+1/2
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