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f(7)=5(7)-7
We simplify the equation to the form, which is simple to understand
f(7)=5(7)-7
Reorder the terms in parentheses
+(+7f)=5*(7)-7
Remove unnecessary parentheses
+7f=+5+*(+7+)-7
Reorder the terms in parentheses
+7f=+(+35)-7
Remove unnecessary parentheses
+7f=+35-7
We move all terms containing f to the left and all other terms to the right.
+7f=+35-7
We simplify left and right side of the equation.
+7f=+28
We divide both sides of the equation by 7 to get f.
f=4
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