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0.5(f+3)=3
We move all terms to the left:
0.5(f+3)-(3)=0
We multiply parentheses
0.5f+1.5-3=0
We add all the numbers together, and all the variables
0.5f-1.5=0
We move all terms containing f to the left, all other terms to the right
0.5f=1.5
f=1.5/0.5
f=3
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