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Simplifying -11 + -1(9 + -3r) = 0 -11 + (9 * -1 + -3r * -1) = 0 -11 + (-9 + 3r) = 0 Combine like terms: -11 + -9 = -20 -20 + 3r = 0 Solving -20 + 3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 3r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 3r = 0 + 20 3r = 0 + 20 Combine like terms: 0 + 20 = 20 3r = 20 Divide each side by '3'. r = 6.666666667 Simplifying r = 6.666666667
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