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Simplifying 12n + 15 = 6n + -21 Reorder the terms: 15 + 12n = 6n + -21 Reorder the terms: 15 + 12n = -21 + 6n Solving 15 + 12n = -21 + 6n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-6n' to each side of the equation. 15 + 12n + -6n = -21 + 6n + -6n Combine like terms: 12n + -6n = 6n 15 + 6n = -21 + 6n + -6n Combine like terms: 6n + -6n = 0 15 + 6n = -21 + 0 15 + 6n = -21 Add '-15' to each side of the equation. 15 + -15 + 6n = -21 + -15 Combine like terms: 15 + -15 = 0 0 + 6n = -21 + -15 6n = -21 + -15 Combine like terms: -21 + -15 = -36 6n = -36 Divide each side by '6'. n = -6 Simplifying n = -6
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