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10+8-13f-12f=0
We simplify the equation to the form, which is simple to understand
10+8-13f-12f=0
We move all terms containing f to the left and all other terms to the right.
-13f-12f=0-10-8
We simplify left and right side of the equation.
-25f=-18
We divide both sides of the equation by -25 to get f.
f=0.72
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