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12(13f-5)=28
We move all terms to the left:
12(13f-5)-(28)=0
We multiply parentheses
156f-60-28=0
We add all the numbers together, and all the variables
156f-88=0
We move all terms containing f to the left, all other terms to the right
156f=88
f=88/156
f=22/39
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