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100f-75=-50f+75
We move all terms to the left:
100f-75-(-50f+75)=0
We get rid of parentheses
100f+50f-75-75=0
We add all the numbers together, and all the variables
150f-150=0
We move all terms containing f to the left, all other terms to the right
150f=150
f=150/150
f=1
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