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f(4)=3(4)-6
We simplify the equation to the form, which is simple to understand
f(4)=3(4)-6
Reorder the terms in parentheses
+(+4f)=3*(4)-6
Remove unnecessary parentheses
+4f=+3+*(+4+)-6
Reorder the terms in parentheses
+4f=+(+12)-6
Remove unnecessary parentheses
+4f=+12-6
We move all terms containing f to the left and all other terms to the right.
+4f=+12-6
We simplify left and right side of the equation.
+4f=+6
We divide both sides of the equation by 4 to get f.
f=1.5
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