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