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Simplifying 0 = 7(n + 9) + 2(n + -3) Reorder the terms: 0 = 7(9 + n) + 2(n + -3) 0 = (9 * 7 + n * 7) + 2(n + -3) 0 = (63 + 7n) + 2(n + -3) Reorder the terms: 0 = 63 + 7n + 2(-3 + n) 0 = 63 + 7n + (-3 * 2 + n * 2) 0 = 63 + 7n + (-6 + 2n) Reorder the terms: 0 = 63 + -6 + 7n + 2n Combine like terms: 63 + -6 = 57 0 = 57 + 7n + 2n Combine like terms: 7n + 2n = 9n 0 = 57 + 9n Solving 0 = 57 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. 0 + -9n = 57 + 9n + -9n Remove the zero: -9n = 57 + 9n + -9n Combine like terms: 9n + -9n = 0 -9n = 57 + 0 -9n = 57 Divide each side by '-9'. n = -6.333333333 Simplifying n = -6.333333333
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