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19=10-f/2
We move all terms to the left:
19-(10-f/2)=0
We add all the numbers together, and all the variables
-(-f/2+10)+19=0
We get rid of parentheses
f/2-10+19=0
We multiply all the terms by the denominator
f-10*2+19*2=0
We add all the numbers together, and all the variables
f+18=0
We move all terms containing f to the left, all other terms to the right
f=-18
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