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Simplifying -4(5r + 4) = 0 Reorder the terms: -4(4 + 5r) = 0 (4 * -4 + 5r * -4) = 0 (-16 + -20r) = 0 Solving -16 + -20r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + -20r = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -20r = 0 + 16 -20r = 0 + 16 Combine like terms: 0 + 16 = 16 -20r = 16 Divide each side by '-20'. r = -0.8 Simplifying r = -0.8
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