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Simplifying -9 + 7(-2r + 5) = 0 Reorder the terms: -9 + 7(5 + -2r) = 0 -9 + (5 * 7 + -2r * 7) = 0 -9 + (35 + -14r) = 0 Combine like terms: -9 + 35 = 26 26 + -14r = 0 Solving 26 + -14r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-26' to each side of the equation. 26 + -26 + -14r = 0 + -26 Combine like terms: 26 + -26 = 0 0 + -14r = 0 + -26 -14r = 0 + -26 Combine like terms: 0 + -26 = -26 -14r = -26 Divide each side by '-14'. r = 1.857142857 Simplifying r = 1.857142857
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