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Simplifying -9 + 3r + 9r + -6 = 0 Reorder the terms: -9 + -6 + 3r + 9r = 0 Combine like terms: -9 + -6 = -15 -15 + 3r + 9r = 0 Combine like terms: 3r + 9r = 12r -15 + 12r = 0 Solving -15 + 12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 12r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 12r = 0 + 15 12r = 0 + 15 Combine like terms: 0 + 15 = 15 12r = 15 Divide each side by '12'. r = 1.25 Simplifying r = 1.25
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