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Simplifying 21 + -6n = -3(n + -5) Reorder the terms: 21 + -6n = -3(-5 + n) 21 + -6n = (-5 * -3 + n * -3) 21 + -6n = (15 + -3n) Solving 21 + -6n = 15 + -3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3n' to each side of the equation. 21 + -6n + 3n = 15 + -3n + 3n Combine like terms: -6n + 3n = -3n 21 + -3n = 15 + -3n + 3n Combine like terms: -3n + 3n = 0 21 + -3n = 15 + 0 21 + -3n = 15 Add '-21' to each side of the equation. 21 + -21 + -3n = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -3n = 15 + -21 -3n = 15 + -21 Combine like terms: 15 + -21 = -6 -3n = -6 Divide each side by '-3'. n = 2 Simplifying n = 2
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