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Simplifying -4(4r + 5) = 0 Reorder the terms: -4(5 + 4r) = 0 (5 * -4 + 4r * -4) = 0 (-20 + -16r) = 0 Solving -20 + -16r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -16r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -16r = 0 + 20 -16r = 0 + 20 Combine like terms: 0 + 20 = 20 -16r = 20 Divide each side by '-16'. r = -1.25 Simplifying r = -1.25
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