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Simplifying 9 + 9n = 7n + 9 Reorder the terms: 9 + 9n = 9 + 7n Add '-9' to each side of the equation. 9 + -9 + 9n = 9 + -9 + 7n Combine like terms: 9 + -9 = 0 0 + 9n = 9 + -9 + 7n 9n = 9 + -9 + 7n Combine like terms: 9 + -9 = 0 9n = 0 + 7n 9n = 7n Solving 9n = 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. 9n + -7n = 7n + -7n Combine like terms: 9n + -7n = 2n 2n = 7n + -7n Combine like terms: 7n + -7n = 0 2n = 0 Divide each side by '2'. n = 0 Simplifying n = 0
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