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Simplifying 2(1 + 3r) = -21 (1 * 2 + 3r * 2) = -21 (2 + 6r) = -21 Solving 2 + 6r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 6r = -21 + -2 Combine like terms: 2 + -2 = 0 0 + 6r = -21 + -2 6r = -21 + -2 Combine like terms: -21 + -2 = -23 6r = -23 Divide each side by '6'. r = -3.833333333 Simplifying r = -3.833333333
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