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-9(-r+7)=3r-(6-3r)
We simplify the equation to the form, which is simple to understand
-9(-r+7)=3r-(6-3r)
Reorder the terms in parentheses
+(+9r-63)=3r-(6-3r)
Remove unnecessary parentheses
+9r-63=+3r-(+6-3r+)
Remove unnecessary parentheses
+9r-63=3r-6+3r
We move all terms containing r to the left and all other terms to the right.
+9r-3r-3r=-6+63
We simplify left and right side of the equation.
+3r=+57
We divide both sides of the equation by 3 to get r.
r=19
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