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Simplifying 5r + 8r + 4 = 40 Reorder the terms: 4 + 5r + 8r = 40 Combine like terms: 5r + 8r = 13r 4 + 13r = 40 Solving 4 + 13r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 13r = 40 + -4 Combine like terms: 4 + -4 = 0 0 + 13r = 40 + -4 13r = 40 + -4 Combine like terms: 40 + -4 = 36 13r = 36 Divide each side by '13'. r = 2.769230769 Simplifying r = 2.769230769
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