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Simplifying 20 + r = 7r + -11r + -10 Reorder the terms: 20 + r = -10 + 7r + -11r Combine like terms: 7r + -11r = -4r 20 + r = -10 + -4r Solving 20 + r = -10 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 20 + r + 4r = -10 + -4r + 4r Combine like terms: r + 4r = 5r 20 + 5r = -10 + -4r + 4r Combine like terms: -4r + 4r = 0 20 + 5r = -10 + 0 20 + 5r = -10 Add '-20' to each side of the equation. 20 + -20 + 5r = -10 + -20 Combine like terms: 20 + -20 = 0 0 + 5r = -10 + -20 5r = -10 + -20 Combine like terms: -10 + -20 = -30 5r = -30 Divide each side by '5'. r = -6 Simplifying r = -6
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