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10f-18=12f-3f
We move all terms to the left:
10f-18-(12f-3f)=0
We add all the numbers together, and all the variables
10f-(+9f)-18=0
We get rid of parentheses
10f-9f-18=0
We add all the numbers together, and all the variables
f-18=0
We move all terms containing f to the left, all other terms to the right
f=18
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