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5(f-9)=-30
We move all terms to the left:
5(f-9)-(-30)=0
We add all the numbers together, and all the variables
5(f-9)+30=0
We multiply parentheses
5f-45+30=0
We add all the numbers together, and all the variables
5f-15=0
We move all terms containing f to the left, all other terms to the right
5f=15
f=15/5
f=3
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