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Simplifying -5(4r + -4) + -4r = -172 Reorder the terms: -5(-4 + 4r) + -4r = -172 (-4 * -5 + 4r * -5) + -4r = -172 (20 + -20r) + -4r = -172 Combine like terms: -20r + -4r = -24r 20 + -24r = -172 Solving 20 + -24r = -172 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 + -24r = -172 + -20 Combine like terms: 20 + -20 = 0 0 + -24r = -172 + -20 -24r = -172 + -20 Combine like terms: -172 + -20 = -192 -24r = -192 Divide each side by '-24'. r = 8 Simplifying r = 8
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