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Simplifying 21 = 2n + -3(4 + -3n) 21 = 2n + (4 * -3 + -3n * -3) 21 = 2n + (-12 + 9n) Reorder the terms: 21 = -12 + 2n + 9n Combine like terms: 2n + 9n = 11n 21 = -12 + 11n Solving 21 = -12 + 11n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-11n' to each side of the equation. 21 + -11n = -12 + 11n + -11n Combine like terms: 11n + -11n = 0 21 + -11n = -12 + 0 21 + -11n = -12 Add '-21' to each side of the equation. 21 + -21 + -11n = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -11n = -12 + -21 -11n = -12 + -21 Combine like terms: -12 + -21 = -33 -11n = -33 Divide each side by '-11'. n = 3 Simplifying n = 3
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