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Simplifying 40r + -40 = 20r + 40 Reorder the terms: -40 + 40r = 20r + 40 Reorder the terms: -40 + 40r = 40 + 20r Solving -40 + 40r = 40 + 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. -40 + 40r + -20r = 40 + 20r + -20r Combine like terms: 40r + -20r = 20r -40 + 20r = 40 + 20r + -20r Combine like terms: 20r + -20r = 0 -40 + 20r = 40 + 0 -40 + 20r = 40 Add '40' to each side of the equation. -40 + 40 + 20r = 40 + 40 Combine like terms: -40 + 40 = 0 0 + 20r = 40 + 40 20r = 40 + 40 Combine like terms: 40 + 40 = 80 20r = 80 Divide each side by '20'. r = 4 Simplifying r = 4
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