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15f=3+18f
We move all terms to the left:
15f-(3+18f)=0
We add all the numbers together, and all the variables
15f-(18f+3)=0
We get rid of parentheses
15f-18f-3=0
We add all the numbers together, and all the variables
-3f-3=0
We move all terms containing f to the left, all other terms to the right
-3f=3
f=3/-3
f=-1
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