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Simplifying (4 + r) * 5 = 40 Reorder the terms for easier multiplication: 5(4 + r) = 40 (4 * 5 + r * 5) = 40 (20 + 5r) = 40 Solving 20 + 5r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 5r = 40 + -20 Combine like terms: 20 + -20 = 0 0 + 5r = 40 + -20 5r = 40 + -20 Combine like terms: 40 + -20 = 20 5r = 20 Divide each side by '5'. r = 4 Simplifying r = 4
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