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Simplifying (20 + 1)(20 + -1) = n Combine like terms: 20 + 1 = 21 (21)(20 + -1) = n Combine like terms: 20 + -1 = 19 21(19) = n Multiply 21 * 19 399 = n Solving 399 = n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 399 + -1n = n + -1n Combine like terms: n + -1n = 0 399 + -1n = 0 Add '-399' to each side of the equation. 399 + -399 + -1n = 0 + -399 Combine like terms: 399 + -399 = 0 0 + -1n = 0 + -399 -1n = 0 + -399 Combine like terms: 0 + -399 = -399 -1n = -399 Divide each side by '-1'. n = 399 Simplifying n = 399
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