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-8(-2+r)=-104
We simplify the equation to the form, which is simple to understand
-8(-2+r)=-104
Reorder the terms in parentheses
+(+16-8r)=-104
Remove unnecessary parentheses
+16-8r=-104
We move all terms containing r to the left and all other terms to the right.
-8r=-104-16
We simplify left and right side of the equation.
-8r=-120
We divide both sides of the equation by -8 to get r.
r=15
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