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f/5--13=12
We simplify the equation to the form, which is simple to understand
f/5+13=12
We move all terms containing f to the left and all other terms to the right.
+ 0.2f=+12-13
We simplify left and right side of the equation.
+ 0.2f=-1
We divide both sides of the equation by 0.2 to get f.
f=-5
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