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Simplifying 21r + 11 = 10r Reorder the terms: 11 + 21r = 10r Solving 11 + 21r = 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. 11 + 21r + -10r = 10r + -10r Combine like terms: 21r + -10r = 11r 11 + 11r = 10r + -10r Combine like terms: 10r + -10r = 0 11 + 11r = 0 Add '-11' to each side of the equation. 11 + -11 + 11r = 0 + -11 Combine like terms: 11 + -11 = 0 0 + 11r = 0 + -11 11r = 0 + -11 Combine like terms: 0 + -11 = -11 11r = -11 Divide each side by '11'. r = -1 Simplifying r = -1
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