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Simplifying 9n + -21 = 42 Reorder the terms: -21 + 9n = 42 Solving -21 + 9n = 42 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 9n = 42 + 21 Combine like terms: -21 + 21 = 0 0 + 9n = 42 + 21 9n = 42 + 21 Combine like terms: 42 + 21 = 63 9n = 63 Divide each side by '9'. n = 7 Simplifying n = 7
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