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Simplifying 20 + 60 = r * 20 Combine like terms: 20 + 60 = 80 80 = r * 20 Reorder the terms for easier multiplication: 80 = 20r Solving 80 = 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. 80 + -20r = 20r + -20r Combine like terms: 20r + -20r = 0 80 + -20r = 0 Add '-80' to each side of the equation. 80 + -80 + -20r = 0 + -80 Combine like terms: 80 + -80 = 0 0 + -20r = 0 + -80 -20r = 0 + -80 Combine like terms: 0 + -80 = -80 -20r = -80 Divide each side by '-20'. r = 4 Simplifying r = 4
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