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f(10)=300-20(10-1)
We simplify the equation to the form, which is simple to understand
f(10)=300-20(10-1)
Reorder the terms in parentheses
+(+10f)=300-20*(+9)
Remove unnecessary parentheses
+10f=+300-20+*(+9+)
Reorder the terms in parentheses
+10f=300+(-180)
Remove unnecessary parentheses
+10f=+300-180
We move all terms containing f to the left and all other terms to the right.
+10f=+300-180
We simplify left and right side of the equation.
+10f=+120
We divide both sides of the equation by 10 to get f.
f=12
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