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10-f/2=19
We move all terms to the left:
10-f/2-(19)=0
We add all the numbers together, and all the variables
-f/2-9=0
We multiply all the terms by the denominator
-f-9*2=0
We add all the numbers together, and all the variables
-1f-18=0
We move all terms containing f to the left, all other terms to the right
-f=18
f=18/-1
f=-18
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