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1.2(f-9)=18
We move all terms to the left:
1.2(f-9)-(18)=0
We multiply parentheses
1.2f-10.8-18=0
We add all the numbers together, and all the variables
1.2f-28.8=0
We move all terms containing f to the left, all other terms to the right
1.2f=28.8
f=28.8/1.2
f=24+3.5527136788005E-15/1.2
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