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Simplifying (r + 4) * 2 = -15 Reorder the terms: (4 + r) * 2 = -15 Reorder the terms for easier multiplication: 2(4 + r) = -15 (4 * 2 + r * 2) = -15 (8 + 2r) = -15 Solving 8 + 2r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 2r = -15 + -8 Combine like terms: 8 + -8 = 0 0 + 2r = -15 + -8 2r = -15 + -8 Combine like terms: -15 + -8 = -23 2r = -23 Divide each side by '2'. r = -11.5 Simplifying r = -11.5
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