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f(3)=f(3-1)-7
We simplify the equation to the form, which is simple to understand
f(3)=f(3-1)-7
Simplifying terms in parentheses
f*(3)=f*(+2)-7
Reorder the terms in parentheses
+(+3f)=f*(+2)-7
Remove unnecessary parentheses
+3f=+f+*(+2+)-7
Reorder the terms in parentheses
+3f=+(+2f)-7
Remove unnecessary parentheses
+3f=+2f-7
We move all terms containing f to the left and all other terms to the right.
+3f-2f=-7
We simplify left and right side of the equation.
+1f=-7
We divide both sides of the equation by 1 to get f.
f=-7
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