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Simplifying -2(4r + 9) = 0 Reorder the terms: -2(9 + 4r) = 0 (9 * -2 + 4r * -2) = 0 (-18 + -8r) = 0 Solving -18 + -8r = 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 + -8r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -8r = 0 + 18 -8r = 0 + 18 Combine like terms: 0 + 18 = 18 -8r = 18 Divide each side by '-8'. r = -2.25 Simplifying r = -2.25
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