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15-11f=-10f
We move all terms to the left:
15-11f-(-10f)=0
We get rid of parentheses
-11f+10f+15=0
We add all the numbers together, and all the variables
-1f+15=0
We move all terms containing f to the left, all other terms to the right
-f=-15
f=-15/-1
f=+15
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