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Simplifying -21 = 1 + 3r + 8r Combine like terms: 3r + 8r = 11r -21 = 1 + 11r Solving -21 = 1 + 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 = 1 + 11r + -11r Combine like terms: 11r + -11r = 0 -21 + -11r = 1 + 0 -21 + -11r = 1 Add '21' to each side of the equation. -21 + 21 + -11r = 1 + 21 Combine like terms: -21 + 21 = 0 0 + -11r = 1 + 21 -11r = 1 + 21 Combine like terms: 1 + 21 = 22 -11r = 22 Divide each side by '-11'. r = -2 Simplifying r = -2
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