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Simplifying 3(n + -7) = 12 Reorder the terms: 3(-7 + n) = 12 (-7 * 3 + n * 3) = 12 (-21 + 3n) = 12 Solving -21 + 3n = 12 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 = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 3n = 12 + 21 3n = 12 + 21 Combine like terms: 12 + 21 = 33 3n = 33 Divide each side by '3'. n = 11 Simplifying n = 11
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