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-2(r-3)+7=8
We simplify the equation to the form, which is simple to understand
-2(r-3)+7=8
Reorder the terms in parentheses
+(-2r+6)+7=8
Remove unnecessary parentheses
-2r+6+7=+8
We move all terms containing r to the left and all other terms to the right.
-2r=+8-6-7
We simplify left and right side of the equation.
-2r=-5
We divide both sides of the equation by -2 to get r.
r=2.5
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