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Simplifying 9r + 4 + 2r + -2 = 0 Reorder the terms: 4 + -2 + 9r + 2r = 0 Combine like terms: 4 + -2 = 2 2 + 9r + 2r = 0 Combine like terms: 9r + 2r = 11r 2 + 11r = 0 Solving 2 + 11r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 11r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 11r = 0 + -2 11r = 0 + -2 Combine like terms: 0 + -2 = -2 11r = -2 Divide each side by '11'. r = -0.1818181818 Simplifying r = -0.1818181818
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