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Simplifying 12 + -3r + -9 = 45 Reorder the terms: 12 + -9 + -3r = 45 Combine like terms: 12 + -9 = 3 3 + -3r = 45 Solving 3 + -3r = 45 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 + -3r = 45 + -3 Combine like terms: 3 + -3 = 0 0 + -3r = 45 + -3 -3r = 45 + -3 Combine like terms: 45 + -3 = 42 -3r = 42 Divide each side by '-3'. r = -14 Simplifying r = -14
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