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Simplifying 8r + -1r + 3 + 2r = 21 Reorder the terms: 3 + 8r + -1r + 2r = 21 Combine like terms: 8r + -1r = 7r 3 + 7r + 2r = 21 Combine like terms: 7r + 2r = 9r 3 + 9r = 21 Solving 3 + 9r = 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 + 9r = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 9r = 21 + -3 9r = 21 + -3 Combine like terms: 21 + -3 = 18 9r = 18 Divide each side by '9'. r = 2 Simplifying r = 2
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