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Simplifying 7n + -21 = 4n + 6 Reorder the terms: -21 + 7n = 4n + 6 Reorder the terms: -21 + 7n = 6 + 4n Solving -21 + 7n = 6 + 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. -21 + 7n + -4n = 6 + 4n + -4n Combine like terms: 7n + -4n = 3n -21 + 3n = 6 + 4n + -4n Combine like terms: 4n + -4n = 0 -21 + 3n = 6 + 0 -21 + 3n = 6 Add '21' to each side of the equation. -21 + 21 + 3n = 6 + 21 Combine like terms: -21 + 21 = 0 0 + 3n = 6 + 21 3n = 6 + 21 Combine like terms: 6 + 21 = 27 3n = 27 Divide each side by '3'. n = 9 Simplifying n = 9
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