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Simplifying 10(2r + 3) = -20 Reorder the terms: 10(3 + 2r) = -20 (3 * 10 + 2r * 10) = -20 (30 + 20r) = -20 Solving 30 + 20r = -20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 20r = -20 + -30 Combine like terms: 30 + -30 = 0 0 + 20r = -20 + -30 20r = -20 + -30 Combine like terms: -20 + -30 = -50 20r = -50 Divide each side by '20'. r = -2.5 Simplifying r = -2.5
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