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15-f/2=10
We move all terms to the left:
15-f/2-(10)=0
We add all the numbers together, and all the variables
-f/2+5=0
We multiply all the terms by the denominator
-f+5*2=0
We add all the numbers together, and all the variables
-1f+10=0
We move all terms containing f to the left, all other terms to the right
-f=-10
f=-10/-1
f=+10
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