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Simplifying n(4n + -5) + (1 + -2n)(1 + 2n) = -9 Reorder the terms: n(-5 + 4n) + (1 + -2n)(1 + 2n) = -9 (-5 * n + 4n * n) + (1 + -2n)(1 + 2n) = -9 (-5n + 4n2) + (1 + -2n)(1 + 2n) = -9 Multiply (1 + -2n) * (1 + 2n) -5n + 4n2 + (1(1 + 2n) + -2n * (1 + 2n)) = -9 -5n + 4n2 + ((1 * 1 + 2n * 1) + -2n * (1 + 2n)) = -9 -5n + 4n2 + ((1 + 2n) + -2n * (1 + 2n)) = -9 -5n + 4n2 + (1 + 2n + (1 * -2n + 2n * -2n)) = -9 -5n + 4n2 + (1 + 2n + (-2n + -4n2)) = -9 Combine like terms: 2n + -2n = 0 -5n + 4n2 + (1 + 0 + -4n2) = -9 -5n + 4n2 + (1 + -4n2) = -9 Reorder the terms: 1 + -5n + 4n2 + -4n2 = -9 Combine like terms: 4n2 + -4n2 = 0 1 + -5n + 0 = -9 1 + -5n = -9 Solving 1 + -5n = -9 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -5n = -9 + -1 Combine like terms: 1 + -1 = 0 0 + -5n = -9 + -1 -5n = -9 + -1 Combine like terms: -9 + -1 = -10 -5n = -10 Divide each side by '-5'. n = 2 Simplifying n = 2
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