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Simplifying n * 9 + -15 = 21 Reorder the terms for easier multiplication: 9n + -15 = 21 Reorder the terms: -15 + 9n = 21 Solving -15 + 9n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 9n = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 9n = 21 + 15 9n = 21 + 15 Combine like terms: 21 + 15 = 36 9n = 36 Divide each side by '9'. n = 4 Simplifying n = 4
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