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Simplifying -13r + 5(1 + -15r) = 0 -13r + (1 * 5 + -15r * 5) = 0 -13r + (5 + -75r) = 0 Reorder the terms: 5 + -13r + -75r = 0 Combine like terms: -13r + -75r = -88r 5 + -88r = 0 Solving 5 + -88r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -88r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -88r = 0 + -5 -88r = 0 + -5 Combine like terms: 0 + -5 = -5 -88r = -5 Divide each side by '-88'. r = 0.05681818182 Simplifying r = 0.05681818182
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