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Simplifying 18r + -9r + 8r + -20r + -9 = 9 Reorder the terms: -9 + 18r + -9r + 8r + -20r = 9 Combine like terms: 18r + -9r = 9r -9 + 9r + 8r + -20r = 9 Combine like terms: 9r + 8r = 17r -9 + 17r + -20r = 9 Combine like terms: 17r + -20r = -3r -9 + -3r = 9 Solving -9 + -3r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -3r = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -3r = 9 + 9 -3r = 9 + 9 Combine like terms: 9 + 9 = 18 -3r = 18 Divide each side by '-3'. r = -6 Simplifying r = -6
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