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Simplifying 3(n + -7) = 3 + -9n Reorder the terms: 3(-7 + n) = 3 + -9n (-7 * 3 + n * 3) = 3 + -9n (-21 + 3n) = 3 + -9n Solving -21 + 3n = 3 + -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. -21 + 3n + 9n = 3 + -9n + 9n Combine like terms: 3n + 9n = 12n -21 + 12n = 3 + -9n + 9n Combine like terms: -9n + 9n = 0 -21 + 12n = 3 + 0 -21 + 12n = 3 Add '21' to each side of the equation. -21 + 21 + 12n = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 12n = 3 + 21 12n = 3 + 21 Combine like terms: 3 + 21 = 24 12n = 24 Divide each side by '12'. n = 2 Simplifying n = 2
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