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Simplifying (n + -7) * 7 = 21 Reorder the terms: (-7 + n) * 7 = 21 Reorder the terms for easier multiplication: 7(-7 + n) = 21 (-7 * 7 + n * 7) = 21 (-49 + 7n) = 21 Solving -49 + 7n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 7n = 21 + 49 Combine like terms: -49 + 49 = 0 0 + 7n = 21 + 49 7n = 21 + 49 Combine like terms: 21 + 49 = 70 7n = 70 Divide each side by '7'. n = 10 Simplifying n = 10
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