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Simplifying (n + -4) * 3 = 21 Reorder the terms: (-4 + n) * 3 = 21 Reorder the terms for easier multiplication: 3(-4 + n) = 21 (-4 * 3 + n * 3) = 21 (-12 + 3n) = 21 Solving -12 + 3n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3n = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 3n = 21 + 12 3n = 21 + 12 Combine like terms: 21 + 12 = 33 3n = 33 Divide each side by '3'. n = 11 Simplifying n = 11
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