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Simplifying 90 = -6(n + -3) + -6n Reorder the terms: 90 = -6(-3 + n) + -6n 90 = (-3 * -6 + n * -6) + -6n 90 = (18 + -6n) + -6n Combine like terms: -6n + -6n = -12n 90 = 18 + -12n Solving 90 = 18 + -12n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '12n' to each side of the equation. 90 + 12n = 18 + -12n + 12n Combine like terms: -12n + 12n = 0 90 + 12n = 18 + 0 90 + 12n = 18 Add '-90' to each side of the equation. 90 + -90 + 12n = 18 + -90 Combine like terms: 90 + -90 = 0 0 + 12n = 18 + -90 12n = 18 + -90 Combine like terms: 18 + -90 = -72 12n = -72 Divide each side by '12'. n = -6 Simplifying n = -6
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