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Simplifying 2.8(3r + 9) + -1.5r = 0 Reorder the terms: 2.8(9 + 3r) + -1.5r = 0 (9 * 2.8 + 3r * 2.8) + -1.5r = 0 (25.2 + 8.4r) + -1.5r = 0 Combine like terms: 8.4r + -1.5r = 6.9r 25.2 + 6.9r = 0 Solving 25.2 + 6.9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25.2' to each side of the equation. 25.2 + -25.2 + 6.9r = 0 + -25.2 Combine like terms: 25.2 + -25.2 = 0.0 0.0 + 6.9r = 0 + -25.2 6.9r = 0 + -25.2 Combine like terms: 0 + -25.2 = -25.2 6.9r = -25.2 Divide each side by '6.9'. r = -3.652173913 Simplifying r = -3.652173913
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