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10(f+3.5)=75
We move all terms to the left:
10(f+3.5)-(75)=0
We multiply parentheses
10f+35-75=0
We add all the numbers together, and all the variables
10f-40=0
We move all terms containing f to the left, all other terms to the right
10f=40
f=40/10
f=4
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