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5-4f=f+20
We simplify the equation to the form, which is simple to understand
5-4f=f+20
We move all terms containing f to the left and all other terms to the right.
-4f-1f=+20-5
We simplify left and right side of the equation.
-5f=+15
We divide both sides of the equation by -5 to get f.
f=-3
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