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Simplifying 11r + -21 + -2r = -42 Reorder the terms: -21 + 11r + -2r = -42 Combine like terms: 11r + -2r = 9r -21 + 9r = -42 Solving -21 + 9r = -42 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 9r = -42 + 21 Combine like terms: -21 + 21 = 0 0 + 9r = -42 + 21 9r = -42 + 21 Combine like terms: -42 + 21 = -21 9r = -21 Divide each side by '9'. r = -2.333333333 Simplifying r = -2.333333333
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