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Simplifying 15 = 43n + -21(n + -4) Reorder the terms: 15 = 43n + -21(-4 + n) 15 = 43n + (-4 * -21 + n * -21) 15 = 43n + (84 + -21n) Reorder the terms: 15 = 84 + 43n + -21n Combine like terms: 43n + -21n = 22n 15 = 84 + 22n Solving 15 = 84 + 22n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-22n' to each side of the equation. 15 + -22n = 84 + 22n + -22n Combine like terms: 22n + -22n = 0 15 + -22n = 84 + 0 15 + -22n = 84 Add '-15' to each side of the equation. 15 + -15 + -22n = 84 + -15 Combine like terms: 15 + -15 = 0 0 + -22n = 84 + -15 -22n = 84 + -15 Combine like terms: 84 + -15 = 69 -22n = 69 Divide each side by '-22'. n = -3.136363636 Simplifying n = -3.136363636
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