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