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Simplifying 18 + -3n + -21 = 0 Reorder the terms: 18 + -21 + -3n = 0 Combine like terms: 18 + -21 = -3 -3 + -3n = 0 Solving -3 + -3n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -3n = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -3n = 0 + 3 -3n = 0 + 3 Combine like terms: 0 + 3 = 3 -3n = 3 Divide each side by '-3'. n = -1 Simplifying n = -1
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