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Simplifying 3(n + -4) + 3 = 12 Reorder the terms: 3(-4 + n) + 3 = 12 (-4 * 3 + n * 3) + 3 = 12 (-12 + 3n) + 3 = 12 Reorder the terms: -12 + 3 + 3n = 12 Combine like terms: -12 + 3 = -9 -9 + 3n = 12 Solving -9 + 3n = 12 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3n = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3n = 12 + 9 3n = 12 + 9 Combine like terms: 12 + 9 = 21 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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