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