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4(f-5)-(2f+3)+9=0
We simplify the equation to the form, which is simple to understand
4(f-5)-(2f+3)+9=0
Reorder the terms in parentheses
+(+4f-20)-(2f+3)+9=0
Remove unnecessary parentheses
+4f-20-(+2f+3+)+9=0
Remove unnecessary parentheses
+4f-20-2f-3+9=0
We move all terms containing f to the left and all other terms to the right.
+4f-2f=0+20+3-9
We simplify left and right side of the equation.
+2f=+14
We divide both sides of the equation by 2 to get f.
f=7
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