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5(7f-3)=28
We move all terms to the left:
5(7f-3)-(28)=0
We multiply parentheses
35f-15-28=0
We add all the numbers together, and all the variables
35f-43=0
We move all terms containing f to the left, all other terms to the right
35f=43
f=43/35
f=1+8/35
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