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-6(-3r+7)-3(r-7)=-66
We simplify the equation to the form, which is simple to understand
-6(-3r+7)-3(r-7)=-66
Reorder the terms in parentheses
+(+18r-42)-3*(r-7)=-66
Remove unnecessary parentheses
+18r-42-3+*(+r-7+)=-66
Reorder the terms in parentheses
+18r-42+(-3r+21)=-66
Remove unnecessary parentheses
+18r-42-3r+21=-66
We move all terms containing r to the left and all other terms to the right.
+18r-3r=-66+42-21
We simplify left and right side of the equation.
+15r=-45
We divide both sides of the equation by 15 to get r.
r=-3
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