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Simplifying -3(4n + 5) = 21 Reorder the terms: -3(5 + 4n) = 21 (5 * -3 + 4n * -3) = 21 (-15 + -12n) = 21 Solving -15 + -12n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -12n = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -12n = 21 + 15 -12n = 21 + 15 Combine like terms: 21 + 15 = 36 -12n = 36 Divide each side by '-12'. n = -3 Simplifying n = -3
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