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Simplifying 9(r + 2) + -4r = 0 Reorder the terms: 9(2 + r) + -4r = 0 (2 * 9 + r * 9) + -4r = 0 (18 + 9r) + -4r = 0 Combine like terms: 9r + -4r = 5r 18 + 5r = 0 Solving 18 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 5r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 5r = 0 + -18 5r = 0 + -18 Combine like terms: 0 + -18 = -18 5r = -18 Divide each side by '5'. r = -3.6 Simplifying r = -3.6
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