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Simplifying 3r + -12 + -5r + 15 = 9 Reorder the terms: -12 + 15 + 3r + -5r = 9 Combine like terms: -12 + 15 = 3 3 + 3r + -5r = 9 Combine like terms: 3r + -5r = -2r 3 + -2r = 9 Solving 3 + -2r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2r = 9 + -3 Combine like terms: 3 + -3 = 0 0 + -2r = 9 + -3 -2r = 9 + -3 Combine like terms: 9 + -3 = 6 -2r = 6 Divide each side by '-2'. r = -3 Simplifying r = -3
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