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