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Simplifying 7(3 + -4n) = 21 + 6n (3 * 7 + -4n * 7) = 21 + 6n (21 + -28n) = 21 + 6n Add '-21' to each side of the equation. 21 + -21 + -28n = 21 + -21 + 6n Combine like terms: 21 + -21 = 0 0 + -28n = 21 + -21 + 6n -28n = 21 + -21 + 6n Combine like terms: 21 + -21 = 0 -28n = 0 + 6n -28n = 6n Solving -28n = 6n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-6n' to each side of the equation. -28n + -6n = 6n + -6n Combine like terms: -28n + -6n = -34n -34n = 6n + -6n Combine like terms: 6n + -6n = 0 -34n = 0 Divide each side by '-34'. n = 0 Simplifying n = 0
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