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Simplifying 81 = -3(8r + 5) Reorder the terms: 81 = -3(5 + 8r) 81 = (5 * -3 + 8r * -3) 81 = (-15 + -24r) Solving 81 = -15 + -24r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '24r' to each side of the equation. 81 + 24r = -15 + -24r + 24r Combine like terms: -24r + 24r = 0 81 + 24r = -15 + 0 81 + 24r = -15 Add '-81' to each side of the equation. 81 + -81 + 24r = -15 + -81 Combine like terms: 81 + -81 = 0 0 + 24r = -15 + -81 24r = -15 + -81 Combine like terms: -15 + -81 = -96 24r = -96 Divide each side by '24'. r = -4 Simplifying r = -4
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