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Simplifying (9 + -1r) * 3 + -12r = 33 Reorder the terms for easier multiplication: 3(9 + -1r) + -12r = 33 (9 * 3 + -1r * 3) + -12r = 33 (27 + -3r) + -12r = 33 Combine like terms: -3r + -12r = -15r 27 + -15r = 33 Solving 27 + -15r = 33 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -15r = 33 + -27 Combine like terms: 27 + -27 = 0 0 + -15r = 33 + -27 -15r = 33 + -27 Combine like terms: 33 + -27 = 6 -15r = 6 Divide each side by '-15'. r = -0.4 Simplifying r = -0.4
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