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Simplifying 4r + (5r + 3) = 23 Reorder the terms: 4r + (3 + 5r) = 23 Remove parenthesis around (3 + 5r) 4r + 3 + 5r = 23 Reorder the terms: 3 + 4r + 5r = 23 Combine like terms: 4r + 5r = 9r 3 + 9r = 23 Solving 3 + 9r = 23 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 = 23 + -3 Combine like terms: 3 + -3 = 0 0 + 9r = 23 + -3 9r = 23 + -3 Combine like terms: 23 + -3 = 20 9r = 20 Divide each side by '9'. r = 2.222222222 Simplifying r = 2.222222222
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