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Simplifying 20r + -40 = 10r + 20 Reorder the terms: -40 + 20r = 10r + 20 Reorder the terms: -40 + 20r = 20 + 10r Solving -40 + 20r = 20 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -40 + 20r + -10r = 20 + 10r + -10r Combine like terms: 20r + -10r = 10r -40 + 10r = 20 + 10r + -10r Combine like terms: 10r + -10r = 0 -40 + 10r = 20 + 0 -40 + 10r = 20 Add '40' to each side of the equation. -40 + 40 + 10r = 20 + 40 Combine like terms: -40 + 40 = 0 0 + 10r = 20 + 40 10r = 20 + 40 Combine like terms: 20 + 40 = 60 10r = 60 Divide each side by '10'. r = 6 Simplifying r = 6
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