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Simplifying 4r + 42 + 5r = 104 Reorder the terms: 42 + 4r + 5r = 104 Combine like terms: 4r + 5r = 9r 42 + 9r = 104 Solving 42 + 9r = 104 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 9r = 104 + -42 Combine like terms: 42 + -42 = 0 0 + 9r = 104 + -42 9r = 104 + -42 Combine like terms: 104 + -42 = 62 9r = 62 Divide each side by '9'. r = 6.888888889 Simplifying r = 6.888888889
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