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Simplifying -5(4r + -8) = 80 Reorder the terms: -5(-8 + 4r) = 80 (-8 * -5 + 4r * -5) = 80 (40 + -20r) = 80 Solving 40 + -20r = 80 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + -20r = 80 + -40 Combine like terms: 40 + -40 = 0 0 + -20r = 80 + -40 -20r = 80 + -40 Combine like terms: 80 + -40 = 40 -20r = 40 Divide each side by '-20'. r = -2 Simplifying r = -2
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