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Simplifying -5(9r + 9) = 0 Reorder the terms: -5(9 + 9r) = 0 (9 * -5 + 9r * -5) = 0 (-45 + -45r) = 0 Solving -45 + -45r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + -45r = 0 + 45 Combine like terms: -45 + 45 = 0 0 + -45r = 0 + 45 -45r = 0 + 45 Combine like terms: 0 + 45 = 45 -45r = 45 Divide each side by '-45'. r = -1 Simplifying r = -1
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