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Simplifying 9 + -1(3r + -1) = 12 Reorder the terms: 9 + -1(-1 + 3r) = 12 9 + (-1 * -1 + 3r * -1) = 12 9 + (1 + -3r) = 12 Combine like terms: 9 + 1 = 10 10 + -3r = 12 Solving 10 + -3r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -3r = 12 + -10 Combine like terms: 10 + -10 = 0 0 + -3r = 12 + -10 -3r = 12 + -10 Combine like terms: 12 + -10 = 2 -3r = 2 Divide each side by '-3'. r = -0.6666666667 Simplifying r = -0.6666666667
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