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Simplifying 9 = 2n + -21 Reorder the terms: 9 = -21 + 2n Solving 9 = -21 + 2n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2n' to each side of the equation. 9 + -2n = -21 + 2n + -2n Combine like terms: 2n + -2n = 0 9 + -2n = -21 + 0 9 + -2n = -21 Add '-9' to each side of the equation. 9 + -9 + -2n = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -2n = -21 + -9 -2n = -21 + -9 Combine like terms: -21 + -9 = -30 -2n = -30 Divide each side by '-2'. n = 15 Simplifying n = 15
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