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f/2-2=-1
We simplify the equation to the form, which is simple to understand
f/2-2=-1
Simplifying:
+ 0.5f-2=-1
We move all terms containing f to the left and all other terms to the right.
+ 0.5f=-1+2
We simplify left and right side of the equation.
+ 0.5f=+1
We divide both sides of the equation by 0.5 to get f.
f=2
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