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Simplifying 9 + -4(5r + -2) = 0 Reorder the terms: 9 + -4(-2 + 5r) = 0 9 + (-2 * -4 + 5r * -4) = 0 9 + (8 + -20r) = 0 Combine like terms: 9 + 8 = 17 17 + -20r = 0 Solving 17 + -20r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + -20r = 0 + -17 Combine like terms: 17 + -17 = 0 0 + -20r = 0 + -17 -20r = 0 + -17 Combine like terms: 0 + -17 = -17 -20r = -17 Divide each side by '-20'. r = 0.85 Simplifying r = 0.85
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