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f(5)=4(5)-2
We simplify the equation to the form, which is simple to understand
f(5)=4(5)-2
Reorder the terms in parentheses
+(+5f)=4*(5)-2
Remove unnecessary parentheses
+5f=+4+*(+5+)-2
Reorder the terms in parentheses
+5f=+(+20)-2
Remove unnecessary parentheses
+5f=+20-2
We move all terms containing f to the left and all other terms to the right.
+5f=+20-2
We simplify left and right side of the equation.
+5f=+18
We divide both sides of the equation by 5 to get f.
f=3.6
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