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Simplifying 13r + -2r + -9r + -1 = 9 Reorder the terms: -1 + 13r + -2r + -9r = 9 Combine like terms: 13r + -2r = 11r -1 + 11r + -9r = 9 Combine like terms: 11r + -9r = 2r -1 + 2r = 9 Solving -1 + 2r = 9 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 + 2r = 9 + 1 Combine like terms: -1 + 1 = 0 0 + 2r = 9 + 1 2r = 9 + 1 Combine like terms: 9 + 1 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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