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Simplifying 3(7r + 2) = 153 Reorder the terms: 3(2 + 7r) = 153 (2 * 3 + 7r * 3) = 153 (6 + 21r) = 153 Solving 6 + 21r = 153 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 + 21r = 153 + -6 Combine like terms: 6 + -6 = 0 0 + 21r = 153 + -6 21r = 153 + -6 Combine like terms: 153 + -6 = 147 21r = 147 Divide each side by '21'. r = 7 Simplifying r = 7
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