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Simplifying 11r + 3 + -12 + 2r = 0 Reorder the terms: 3 + -12 + 11r + 2r = 0 Combine like terms: 3 + -12 = -9 -9 + 11r + 2r = 0 Combine like terms: 11r + 2r = 13r -9 + 13r = 0 Solving -9 + 13r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 13r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 13r = 0 + 9 13r = 0 + 9 Combine like terms: 0 + 9 = 9 13r = 9 Divide each side by '13'. r = 0.6923076923 Simplifying r = 0.6923076923
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