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Simplifying (r + 9)(-4) = 0 Reorder the terms: (9 + r)(-4) = 0 Reorder the terms for easier multiplication: -4(9 + r) = 0 (9 * -4 + r * -4) = 0 (-36 + -4r) = 0 Solving -36 + -4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + -4r = 0 + 36 Combine like terms: -36 + 36 = 0 0 + -4r = 0 + 36 -4r = 0 + 36 Combine like terms: 0 + 36 = 36 -4r = 36 Divide each side by '-4'. r = -9 Simplifying r = -9
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