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Simplifying (n + -7) * 3 = 15 Reorder the terms: (-7 + n) * 3 = 15 Reorder the terms for easier multiplication: 3(-7 + n) = 15 (-7 * 3 + n * 3) = 15 (-21 + 3n) = 15 Solving -21 + 3n = 15 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 + 3n = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 3n = 15 + 21 3n = 15 + 21 Combine like terms: 15 + 21 = 36 3n = 36 Divide each side by '3'. n = 12 Simplifying n = 12
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