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11r+8(1-9r)=9r+8(-11r-8)
We simplify the equation to the form, which is simple to understand
11r+8(1-9r)=9r+8(-11r-8)
Reorder the terms in parentheses
11r+(+8-72r)=9r+8*(-11r-8)
Remove unnecessary parentheses
+11r+8-72r=+9r+8+*(-11r-8+)
Reorder the terms in parentheses
11r+8-72r=9r+(-88r-64)
Remove unnecessary parentheses
+11r+8-72r=+9r-88r-64
We move all terms containing r to the left and all other terms to the right.
+11r-72r-9r+88r=-64-8
We simplify left and right side of the equation.
+18r=-72
We divide both sides of the equation by 18 to get r.
r=-4
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