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100+f/2=50
We move all terms to the left:
100+f/2-(50)=0
We add all the numbers together, and all the variables
f/2+50=0
We multiply all the terms by the denominator
f+50*2=0
We add all the numbers together, and all the variables
f+100=0
We move all terms containing f to the left, all other terms to the right
f=-100
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