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-1(-4r)=0
We simplify the equation to the form, which is simple to understand
-1(-4r)=0
Reorder the terms in parentheses
+(+4r)=0
Remove unnecessary parentheses
+4r=0
We move all terms containing r to the left and all other terms to the right.
+4r=0
We simplify left and right side of the equation.
+4r=0
We divide both sides of the equation by 4 to get r.
r=0
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