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Simplifying 5r + 8r + -1 = 19 Reorder the terms: -1 + 5r + 8r = 19 Combine like terms: 5r + 8r = 13r -1 + 13r = 19 Solving -1 + 13r = 19 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 13r = 19 + 1 Combine like terms: -1 + 1 = 0 0 + 13r = 19 + 1 13r = 19 + 1 Combine like terms: 19 + 1 = 20 13r = 20 Divide each side by '13'. r = 1.538461538 Simplifying r = 1.538461538
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