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f-15=5+2f
We move all terms to the left:
f-15-(5+2f)=0
We add all the numbers together, and all the variables
f-(2f+5)-15=0
We get rid of parentheses
f-2f-5-15=0
We add all the numbers together, and all the variables
-1f-20=0
We move all terms containing f to the left, all other terms to the right
-f=20
f=20/-1
f=-20
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