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Simplifying 20r + 80 = 40r + -120 Reorder the terms: 80 + 20r = 40r + -120 Reorder the terms: 80 + 20r = -120 + 40r Solving 80 + 20r = -120 + 40r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40r' to each side of the equation. 80 + 20r + -40r = -120 + 40r + -40r Combine like terms: 20r + -40r = -20r 80 + -20r = -120 + 40r + -40r Combine like terms: 40r + -40r = 0 80 + -20r = -120 + 0 80 + -20r = -120 Add '-80' to each side of the equation. 80 + -80 + -20r = -120 + -80 Combine like terms: 80 + -80 = 0 0 + -20r = -120 + -80 -20r = -120 + -80 Combine like terms: -120 + -80 = -200 -20r = -200 Divide each side by '-20'. r = 10 Simplifying r = 10
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