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12f-174=5f-13
We move all terms to the left:
12f-174-(5f-13)=0
We get rid of parentheses
12f-5f+13-174=0
We add all the numbers together, and all the variables
7f-161=0
We move all terms containing f to the left, all other terms to the right
7f=161
f=161/7
f=23
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