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Simplifying 2r + 3 + 9r = 21 Reorder the terms: 3 + 2r + 9r = 21 Combine like terms: 2r + 9r = 11r 3 + 11r = 21 Solving 3 + 11r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 11r = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 11r = 21 + -3 11r = 21 + -3 Combine like terms: 21 + -3 = 18 11r = 18 Divide each side by '11'. r = 1.636363636 Simplifying r = 1.636363636
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