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Simplifying 2r + -6 + -7r + -9 = 0 Reorder the terms: -6 + -9 + 2r + -7r = 0 Combine like terms: -6 + -9 = -15 -15 + 2r + -7r = 0 Combine like terms: 2r + -7r = -5r -15 + -5r = 0 Solving -15 + -5r = 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 + -5r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -5r = 0 + 15 -5r = 0 + 15 Combine like terms: 0 + 15 = 15 -5r = 15 Divide each side by '-5'. r = -3 Simplifying r = -3
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