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Simplifying 9n + -21 = -9 + 7n Reorder the terms: -21 + 9n = -9 + 7n Solving -21 + 9n = -9 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. -21 + 9n + -7n = -9 + 7n + -7n Combine like terms: 9n + -7n = 2n -21 + 2n = -9 + 7n + -7n Combine like terms: 7n + -7n = 0 -21 + 2n = -9 + 0 -21 + 2n = -9 Add '21' to each side of the equation. -21 + 21 + 2n = -9 + 21 Combine like terms: -21 + 21 = 0 0 + 2n = -9 + 21 2n = -9 + 21 Combine like terms: -9 + 21 = 12 2n = 12 Divide each side by '2'. n = 6 Simplifying n = 6
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