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4f+(9+f)5-3=0
We simplify the equation to the form, which is simple to understand
4f+(9+f)5-3=0
Reorder the terms in parentheses
4f+(+45+5f)-3=0
Remove unnecessary parentheses
+4f+45+5f-3=0
We move all terms containing f to the left and all other terms to the right.
+4f+5f=0-45+3
We simplify left and right side of the equation.
+9f=-42
We divide both sides of the equation by 9 to get f.
f=-4.66666666667
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