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f(3)=7-4(3)
We simplify the equation to the form, which is simple to understand
f(3)=7-4(3)
Reorder the terms in parentheses
+(+3f)=7-4*(3)
Remove unnecessary parentheses
+3f=+7-4+*(+3+)
Reorder the terms in parentheses
+3f=7+(-12)
Remove unnecessary parentheses
+3f=+7-12
We move all terms containing f to the left and all other terms to the right.
+3f=+7-12
We simplify left and right side of the equation.
+3f=-5
We divide both sides of the equation by 3 to get f.
f=-1.66666666667
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