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Simplifying (x + 4)(x + -5) = (x + 1)(x + 1) Reorder the terms: (4 + x)(x + -5) = (x + 1)(x + 1) Reorder the terms: (4 + x)(-5 + x) = (x + 1)(x + 1) Multiply (4 + x) * (-5 + x) (4(-5 + x) + x(-5 + x)) = (x + 1)(x + 1) ((-5 * 4 + x * 4) + x(-5 + x)) = (x + 1)(x + 1) ((-20 + 4x) + x(-5 + x)) = (x + 1)(x + 1) (-20 + 4x + (-5 * x + x * x)) = (x + 1)(x + 1) (-20 + 4x + (-5x + x2)) = (x + 1)(x + 1) Combine like terms: 4x + -5x = -1x (-20 + -1x + x2) = (x + 1)(x + 1) Reorder the terms: -20 + -1x + x2 = (1 + x)(x + 1) Reorder the terms: -20 + -1x + x2 = (1 + x)(1 + x) Multiply (1 + x) * (1 + x) -20 + -1x + x2 = (1(1 + x) + x(1 + x)) -20 + -1x + x2 = ((1 * 1 + x * 1) + x(1 + x)) -20 + -1x + x2 = ((1 + 1x) + x(1 + x)) -20 + -1x + x2 = (1 + 1x + (1 * x + x * x)) -20 + -1x + x2 = (1 + 1x + (1x + x2)) Combine like terms: 1x + 1x = 2x -20 + -1x + x2 = (1 + 2x + x2) Add '-1x2' to each side of the equation. -20 + -1x + x2 + -1x2 = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -20 + -1x + 0 = 1 + 2x + x2 + -1x2 -20 + -1x = 1 + 2x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -20 + -1x = 1 + 2x + 0 -20 + -1x = 1 + 2x Solving -20 + -1x = 1 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -20 + -1x + -2x = 1 + 2x + -2x Combine like terms: -1x + -2x = -3x -20 + -3x = 1 + 2x + -2x Combine like terms: 2x + -2x = 0 -20 + -3x = 1 + 0 -20 + -3x = 1 Add '20' to each side of the equation. -20 + 20 + -3x = 1 + 20 Combine like terms: -20 + 20 = 0 0 + -3x = 1 + 20 -3x = 1 + 20 Combine like terms: 1 + 20 = 21 -3x = 21 Divide each side by '-3'. x = -7 Simplifying x = -7
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