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Simplifying (x + -3)(x + 5) + -1(x + -6)(x + 6) = 0 Reorder the terms: (-3 + x)(x + 5) + -1(x + -6)(x + 6) = 0 Reorder the terms: (-3 + x)(5 + x) + -1(x + -6)(x + 6) = 0 Multiply (-3 + x) * (5 + x) (-3(5 + x) + x(5 + x)) + -1(x + -6)(x + 6) = 0 ((5 * -3 + x * -3) + x(5 + x)) + -1(x + -6)(x + 6) = 0 ((-15 + -3x) + x(5 + x)) + -1(x + -6)(x + 6) = 0 (-15 + -3x + (5 * x + x * x)) + -1(x + -6)(x + 6) = 0 (-15 + -3x + (5x + x2)) + -1(x + -6)(x + 6) = 0 Combine like terms: -3x + 5x = 2x (-15 + 2x + x2) + -1(x + -6)(x + 6) = 0 Reorder the terms: -15 + 2x + x2 + -1(-6 + x)(x + 6) = 0 Reorder the terms: -15 + 2x + x2 + -1(-6 + x)(6 + x) = 0 Multiply (-6 + x) * (6 + x) -15 + 2x + x2 + -1(-6(6 + x) + x(6 + x)) = 0 -15 + 2x + x2 + -1((6 * -6 + x * -6) + x(6 + x)) = 0 -15 + 2x + x2 + -1((-36 + -6x) + x(6 + x)) = 0 -15 + 2x + x2 + -1(-36 + -6x + (6 * x + x * x)) = 0 -15 + 2x + x2 + -1(-36 + -6x + (6x + x2)) = 0 Combine like terms: -6x + 6x = 0 -15 + 2x + x2 + -1(-36 + 0 + x2) = 0 -15 + 2x + x2 + -1(-36 + x2) = 0 -15 + 2x + x2 + (-36 * -1 + x2 * -1) = 0 -15 + 2x + x2 + (36 + -1x2) = 0 Reorder the terms: -15 + 36 + 2x + x2 + -1x2 = 0 Combine like terms: -15 + 36 = 21 21 + 2x + x2 + -1x2 = 0 Combine like terms: x2 + -1x2 = 0 21 + 2x + 0 = 0 21 + 2x = 0 Solving 21 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 2x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 0 + -21 2x = 0 + -21 Combine like terms: 0 + -21 = -21 2x = -21 Divide each side by '2'. x = -10.5 Simplifying x = -10.5
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