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Simplifying 11r + 20 = -20 + 15r Reorder the terms: 20 + 11r = -20 + 15r Solving 20 + 11r = -20 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 20 + 11r + -15r = -20 + 15r + -15r Combine like terms: 11r + -15r = -4r 20 + -4r = -20 + 15r + -15r Combine like terms: 15r + -15r = 0 20 + -4r = -20 + 0 20 + -4r = -20 Add '-20' to each side of the equation. 20 + -20 + -4r = -20 + -20 Combine like terms: 20 + -20 = 0 0 + -4r = -20 + -20 -4r = -20 + -20 Combine like terms: -20 + -20 = -40 -4r = -40 Divide each side by '-4'. r = 10 Simplifying r = 10
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