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-3(6-2r)-3r=0
We simplify the equation to the form, which is simple to understand
-3(6-2r)-3r=0
Reorder the terms in parentheses
+(-18+6r)-3r=0
Remove unnecessary parentheses
-18+6r-3r=0
We move all terms containing r to the left and all other terms to the right.
+6r-3r=0+18
We simplify left and right side of the equation.
+3r=+18
We divide both sides of the equation by 3 to get r.
r=6
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