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Simplifying (n + -9) * 7 = 21 Reorder the terms: (-9 + n) * 7 = 21 Reorder the terms for easier multiplication: 7(-9 + n) = 21 (-9 * 7 + n * 7) = 21 (-63 + 7n) = 21 Solving -63 + 7n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 7n = 21 + 63 Combine like terms: -63 + 63 = 0 0 + 7n = 21 + 63 7n = 21 + 63 Combine like terms: 21 + 63 = 84 7n = 84 Divide each side by '7'. n = 12 Simplifying n = 12
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