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Simplifying 21 + (n + -1) * -3 = 0 Reorder the terms: 21 + (-1 + n) * -3 = 0 Reorder the terms for easier multiplication: 21 + -3(-1 + n) = 0 21 + (-1 * -3 + n * -3) = 0 21 + (3 + -3n) = 0 Combine like terms: 21 + 3 = 24 24 + -3n = 0 Solving 24 + -3n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + -3n = 0 + -24 Combine like terms: 24 + -24 = 0 0 + -3n = 0 + -24 -3n = 0 + -24 Combine like terms: 0 + -24 = -24 -3n = -24 Divide each side by '-3'. n = 8 Simplifying n = 8
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