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4(f+3)=30
We move all terms to the left:
4(f+3)-(30)=0
We multiply parentheses
4f+12-30=0
We add all the numbers together, and all the variables
4f-18=0
We move all terms containing f to the left, all other terms to the right
4f=18
f=18/4
f=4+1/2
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