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-15=-3+f
We move all terms to the left:
-15-(-3+f)=0
We add all the numbers together, and all the variables
-(f-3)-15=0
We get rid of parentheses
-f+3-15=0
We add all the numbers together, and all the variables
-1f-12=0
We move all terms containing f to the left, all other terms to the right
-f=12
f=12/-1
f=-12
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