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Simplifying (11) * r + -1(13) * r + -1(11) = 9 Multiply -1 * 13 11r + -13r + -1(11) = 9 Multiply -1 * 11 11r + -13r + -11 = 9 Reorder the terms: -11 + 11r + -13r = 9 Combine like terms: 11r + -13r = -2r -11 + -2r = 9 Solving -11 + -2r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + -2r = 9 + 11 Combine like terms: -11 + 11 = 0 0 + -2r = 9 + 11 -2r = 9 + 11 Combine like terms: 9 + 11 = 20 -2r = 20 Divide each side by '-2'. r = -10 Simplifying r = -10
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