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Simplifying 9r + -2(2r + 9) = 0 Reorder the terms: 9r + -2(9 + 2r) = 0 9r + (9 * -2 + 2r * -2) = 0 9r + (-18 + -4r) = 0 Reorder the terms: -18 + 9r + -4r = 0 Combine like terms: 9r + -4r = 5r -18 + 5r = 0 Solving -18 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 5r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 5r = 0 + 18 5r = 0 + 18 Combine like terms: 0 + 18 = 18 5r = 18 Divide each side by '5'. r = 3.6 Simplifying r = 3.6
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