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-8(2-r)=40
We simplify the equation to the form, which is simple to understand
-8(2-r)=40
Reorder the terms in parentheses
+(-16+8r)=40
Remove unnecessary parentheses
-16+8r=+40
We move all terms containing r to the left and all other terms to the right.
+8r=+40+16
We simplify left and right side of the equation.
+8r=+56
We divide both sides of the equation by 8 to get r.
r=7
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