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Simplifying 3(7 + 7n) + -1 = -127 (7 * 3 + 7n * 3) + -1 = -127 (21 + 21n) + -1 = -127 Reorder the terms: 21 + -1 + 21n = -127 Combine like terms: 21 + -1 = 20 20 + 21n = -127 Solving 20 + 21n = -127 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 21n = -127 + -20 Combine like terms: 20 + -20 = 0 0 + 21n = -127 + -20 21n = -127 + -20 Combine like terms: -127 + -20 = -147 21n = -147 Divide each side by '21'. n = -7 Simplifying n = -7
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