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-f+5+4f=5
We simplify the equation to the form, which is simple to understand
-f+5+4f=5
We move all terms containing f to the left and all other terms to the right.
-1f+4f=+5-5
We simplify left and right side of the equation.
+3f=0
We divide both sides of the equation by 3 to get f.
f=0
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