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Simplifying -6n + 9 = -21 + 6n Reorder the terms: 9 + -6n = -21 + 6n Solving 9 + -6n = -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. 9 + -6n + -6n = -21 + 6n + -6n Combine like terms: -6n + -6n = -12n 9 + -12n = -21 + 6n + -6n Combine like terms: 6n + -6n = 0 9 + -12n = -21 + 0 9 + -12n = -21 Add '-9' to each side of the equation. 9 + -9 + -12n = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -12n = -21 + -9 -12n = -21 + -9 Combine like terms: -21 + -9 = -30 -12n = -30 Divide each side by '-12'. n = 2.5 Simplifying n = 2.5
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