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Simplifying 3[3 + -1r] + -3 = 18 [3 * 3 + -1r * 3] + -3 = 18 [9 + -3r] + -3 = 18 Reorder the terms: 9 + -3 + -3r = 18 Combine like terms: 9 + -3 = 6 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 = 12 -3r = 12 Divide each side by '-3'. r = -4 Simplifying r = -4
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