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7=f/2+3
We move all terms to the left:
7-(f/2+3)=0
We get rid of parentheses
-f/2-3+7=0
We multiply all the terms by the denominator
-f-3*2+7*2=0
We add all the numbers together, and all the variables
-1f+8=0
We move all terms containing f to the left, all other terms to the right
-f=-8
f=-8/-1
f=+8
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