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10f-45=2f+43
We move all terms to the left:
10f-45-(2f+43)=0
We get rid of parentheses
10f-2f-43-45=0
We add all the numbers together, and all the variables
8f-88=0
We move all terms containing f to the left, all other terms to the right
8f=88
f=88/8
f=11
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