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Simplifying 20 + 11r + 12r = -16 + 20r Combine like terms: 11r + 12r = 23r 20 + 23r = -16 + 20r Solving 20 + 23r = -16 + 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. 20 + 23r + -20r = -16 + 20r + -20r Combine like terms: 23r + -20r = 3r 20 + 3r = -16 + 20r + -20r Combine like terms: 20r + -20r = 0 20 + 3r = -16 + 0 20 + 3r = -16 Add '-20' to each side of the equation. 20 + -20 + 3r = -16 + -20 Combine like terms: 20 + -20 = 0 0 + 3r = -16 + -20 3r = -16 + -20 Combine like terms: -16 + -20 = -36 3r = -36 Divide each side by '3'. r = -12 Simplifying r = -12
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