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Simplifying -3(n + -7) = -9 Reorder the terms: -3(-7 + n) = -9 (-7 * -3 + n * -3) = -9 (21 + -3n) = -9 Solving 21 + -3n = -9 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3n = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -3n = -9 + -21 -3n = -9 + -21 Combine like terms: -9 + -21 = -30 -3n = -30 Divide each side by '-3'. n = 10 Simplifying n = 10
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