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Simplifying 21 = 7(3 + 24n) 21 = (3 * 7 + 24n * 7) 21 = (21 + 168n) Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + 168n Combine like terms: 21 + -21 = 0 0 = 21 + -21 + 168n Combine like terms: 21 + -21 = 0 0 = 0 + 168n 0 = 168n Solving 0 = 168n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-168n' to each side of the equation. 0 + -168n = 168n + -168n Remove the zero: -168n = 168n + -168n Combine like terms: 168n + -168n = 0 -168n = 0 Divide each side by '-168'. n = 0 Simplifying n = 0
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