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Simplifying -1(-2 + 8r) = 6 + -15r (-2 * -1 + 8r * -1) = 6 + -15r (2 + -8r) = 6 + -15r Solving 2 + -8r = 6 + -15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15r' to each side of the equation. 2 + -8r + 15r = 6 + -15r + 15r Combine like terms: -8r + 15r = 7r 2 + 7r = 6 + -15r + 15r Combine like terms: -15r + 15r = 0 2 + 7r = 6 + 0 2 + 7r = 6 Add '-2' to each side of the equation. 2 + -2 + 7r = 6 + -2 Combine like terms: 2 + -2 = 0 0 + 7r = 6 + -2 7r = 6 + -2 Combine like terms: 6 + -2 = 4 7r = 4 Divide each side by '7'. r = 0.5714285714 Simplifying r = 0.5714285714
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