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Simplifying 5(r + 20) = 45 Reorder the terms: 5(20 + r) = 45 (20 * 5 + r * 5) = 45 (100 + 5r) = 45 Solving 100 + 5r = 45 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + 5r = 45 + -100 Combine like terms: 100 + -100 = 0 0 + 5r = 45 + -100 5r = 45 + -100 Combine like terms: 45 + -100 = -55 5r = -55 Divide each side by '5'. r = -11 Simplifying r = -11
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