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Simplifying -9 + -1r + 10r + 2r = 20 Combine like terms: -1r + 10r = 9r -9 + 9r + 2r = 20 Combine like terms: 9r + 2r = 11r -9 + 11r = 20 Solving -9 + 11r = 20 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 + 11r = 20 + 9 Combine like terms: -9 + 9 = 0 0 + 11r = 20 + 9 11r = 20 + 9 Combine like terms: 20 + 9 = 29 11r = 29 Divide each side by '11'. r = 2.636363636 Simplifying r = 2.636363636
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