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Simplifying 1r + 3 + 2r = -21 Reorder the terms: 3 + 1r + 2r = -21 Combine like terms: 1r + 2r = 3r 3 + 3r = -21 Solving 3 + 3r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3r = -21 + -3 Combine like terms: 3 + -3 = 0 0 + 3r = -21 + -3 3r = -21 + -3 Combine like terms: -21 + -3 = -24 3r = -24 Divide each side by '3'. r = -8 Simplifying r = -8
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