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-4(9+r)=-100
We simplify the equation to the form, which is simple to understand
-4(9+r)=-100
Reorder the terms in parentheses
+(-36-4r)=-100
Remove unnecessary parentheses
-36-4r=-100
We move all terms containing r to the left and all other terms to the right.
-4r=-100+36
We simplify left and right side of the equation.
-4r=-64
We divide both sides of the equation by -4 to get r.
r=16
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