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-9(r+8)+9r=12(r+8)
We simplify the equation to the form, which is simple to understand
-9(r+8)+9r=12(r+8)
Reorder the terms in parentheses
+(-9r-72)+9r=12*(r+8)
Remove unnecessary parentheses
-9r-72+9r=+12+*(+r+8+)
Reorder the terms in parentheses
-9r-72+9r=+(+12r+96)
Remove unnecessary parentheses
-9r-72+9r=+12r+96
We move all terms containing r to the left and all other terms to the right.
-9r+9r-12r=+96+72
We simplify left and right side of the equation.
-12r=+168
We divide both sides of the equation by -12 to get r.
r=-14
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