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Simplifying 20 + 20 + 7r = 12r + -20 Combine like terms: 20 + 20 = 40 40 + 7r = 12r + -20 Reorder the terms: 40 + 7r = -20 + 12r Solving 40 + 7r = -20 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 40 + 7r + -12r = -20 + 12r + -12r Combine like terms: 7r + -12r = -5r 40 + -5r = -20 + 12r + -12r Combine like terms: 12r + -12r = 0 40 + -5r = -20 + 0 40 + -5r = -20 Add '-40' to each side of the equation. 40 + -40 + -5r = -20 + -40 Combine like terms: 40 + -40 = 0 0 + -5r = -20 + -40 -5r = -20 + -40 Combine like terms: -20 + -40 = -60 -5r = -60 Divide each side by '-5'. r = 12 Simplifying r = 12
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