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Simplifying 90 = -6(3 + -3n) 90 = (3 * -6 + -3n * -6) 90 = (-18 + 18n) Solving 90 = -18 + 18n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-18n' to each side of the equation. 90 + -18n = -18 + 18n + -18n Combine like terms: 18n + -18n = 0 90 + -18n = -18 + 0 90 + -18n = -18 Add '-90' to each side of the equation. 90 + -90 + -18n = -18 + -90 Combine like terms: 90 + -90 = 0 0 + -18n = -18 + -90 -18n = -18 + -90 Combine like terms: -18 + -90 = -108 -18n = -108 Divide each side by '-18'. n = 6 Simplifying n = 6
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