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Simplifying 9(n + 7) = 21 Reorder the terms: 9(7 + n) = 21 (7 * 9 + n * 9) = 21 (63 + 9n) = 21 Solving 63 + 9n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 9n = 21 + -63 Combine like terms: 63 + -63 = 0 0 + 9n = 21 + -63 9n = 21 + -63 Combine like terms: 21 + -63 = -42 9n = -42 Divide each side by '9'. n = -4.666666667 Simplifying n = -4.666666667
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