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4.5(5f-5)=37.5-7.5f
We move all terms to the left:
4.5(5f-5)-(37.5-7.5f)=0
We add all the numbers together, and all the variables
4.5(5f-5)-(-7.5f+37.5)=0
We multiply parentheses
22.5f-(-7.5f+37.5)-22.5=0
We get rid of parentheses
22.5f+7.5f-37.5-22.5=0
We add all the numbers together, and all the variables
30f-60=0
We move all terms containing f to the left, all other terms to the right
30f=60
f=60/30
f=2
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