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-3=5f+15
We move all terms to the left:
-3-(5f+15)=0
We get rid of parentheses
-5f-15-3=0
We add all the numbers together, and all the variables
-5f-18=0
We move all terms containing f to the left, all other terms to the right
-5f=18
f=18/-5
f=-3+3/5
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