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Simplifying 21 = 11r + -45 Reorder the terms: 21 = -45 + 11r Solving 21 = -45 + 11r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11r' to each side of the equation. 21 + -11r = -45 + 11r + -11r Combine like terms: 11r + -11r = 0 21 + -11r = -45 + 0 21 + -11r = -45 Add '-21' to each side of the equation. 21 + -21 + -11r = -45 + -21 Combine like terms: 21 + -21 = 0 0 + -11r = -45 + -21 -11r = -45 + -21 Combine like terms: -45 + -21 = -66 -11r = -66 Divide each side by '-11'. r = 6 Simplifying r = 6
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