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f(1)=-1+1
We simplify the equation to the form, which is simple to understand
f(1)=-1+1
Reorder the terms in parentheses
+(+1f)=-1+1
Remove unnecessary parentheses
+1f=-1+1
We move all terms containing f to the left and all other terms to the right.
+1f=-1+1
We simplify left and right side of the equation.
+1f=0
We divide both sides of the equation by 1 to get f.
f=0
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