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Simplifying 5(10r + 3) + -7r = 0 Reorder the terms: 5(3 + 10r) + -7r = 0 (3 * 5 + 10r * 5) + -7r = 0 (15 + 50r) + -7r = 0 Combine like terms: 50r + -7r = 43r 15 + 43r = 0 Solving 15 + 43r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 43r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 43r = 0 + -15 43r = 0 + -15 Combine like terms: 0 + -15 = -15 43r = -15 Divide each side by '43'. r = -0.3488372093 Simplifying r = -0.3488372093
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