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Simplifying 7(r + 9) = 147 Reorder the terms: 7(9 + r) = 147 (9 * 7 + r * 7) = 147 (63 + 7r) = 147 Solving 63 + 7r = 147 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 7r = 147 + -63 Combine like terms: 63 + -63 = 0 0 + 7r = 147 + -63 7r = 147 + -63 Combine like terms: 147 + -63 = 84 7r = 84 Divide each side by '7'. r = 12 Simplifying r = 12
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