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Simplifying -3[2 + -1r] = 18 [2 * -3 + -1r * -3] = 18 [-6 + 3r] = 18 Solving -6 + 3r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3r = 18 + 6 Combine like terms: -6 + 6 = 0 0 + 3r = 18 + 6 3r = 18 + 6 Combine like terms: 18 + 6 = 24 3r = 24 Divide each side by '3'. r = 8 Simplifying r = 8
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