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Simplifying (n + -6) * 3 = 21 Reorder the terms: (-6 + n) * 3 = 21 Reorder the terms for easier multiplication: 3(-6 + n) = 21 (-6 * 3 + n * 3) = 21 (-18 + 3n) = 21 Solving -18 + 3n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 3n = 21 + 18 Combine like terms: -18 + 18 = 0 0 + 3n = 21 + 18 3n = 21 + 18 Combine like terms: 21 + 18 = 39 3n = 39 Divide each side by '3'. n = 13 Simplifying n = 13
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