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Simplifying -9(r + 5s + -9) = 0 Reorder the terms: -9(-9 + r + 5s) = 0 (-9 * -9 + r * -9 + 5s * -9) = 0 (81 + -9r + -45s) = 0 Solving 81 + -9r + -45s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -9r + -81 + -45s = 0 + -81 Reorder the terms: 81 + -81 + -9r + -45s = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -9r + -45s = 0 + -81 -9r + -45s = 0 + -81 Combine like terms: 0 + -81 = -81 -9r + -45s = -81 Add '45s' to each side of the equation. -9r + -45s + 45s = -81 + 45s Combine like terms: -45s + 45s = 0 -9r + 0 = -81 + 45s -9r = -81 + 45s Divide each side by '-9'. r = 9 + -5s Simplifying r = 9 + -5s
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