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Simplifying 3[r + 24] = 390 Reorder the terms: 3[24 + r] = 390 [24 * 3 + r * 3] = 390 [72 + 3r] = 390 Solving 72 + 3r = 390 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-72' to each side of the equation. 72 + -72 + 3r = 390 + -72 Combine like terms: 72 + -72 = 0 0 + 3r = 390 + -72 3r = 390 + -72 Combine like terms: 390 + -72 = 318 3r = 318 Divide each side by '3'. r = 106 Simplifying r = 106
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