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Simplifying (x + -4)(x + 1) + -1(x + 7)(x + -3) = -7x + 17 Reorder the terms: (-4 + x)(x + 1) + -1(x + 7)(x + -3) = -7x + 17 Reorder the terms: (-4 + x)(1 + x) + -1(x + 7)(x + -3) = -7x + 17 Multiply (-4 + x) * (1 + x) (-4(1 + x) + x(1 + x)) + -1(x + 7)(x + -3) = -7x + 17 ((1 * -4 + x * -4) + x(1 + x)) + -1(x + 7)(x + -3) = -7x + 17 ((-4 + -4x) + x(1 + x)) + -1(x + 7)(x + -3) = -7x + 17 (-4 + -4x + (1 * x + x * x)) + -1(x + 7)(x + -3) = -7x + 17 (-4 + -4x + (1x + x2)) + -1(x + 7)(x + -3) = -7x + 17 Combine like terms: -4x + 1x = -3x (-4 + -3x + x2) + -1(x + 7)(x + -3) = -7x + 17 Reorder the terms: -4 + -3x + x2 + -1(7 + x)(x + -3) = -7x + 17 Reorder the terms: -4 + -3x + x2 + -1(7 + x)(-3 + x) = -7x + 17 Multiply (7 + x) * (-3 + x) -4 + -3x + x2 + -1(7(-3 + x) + x(-3 + x)) = -7x + 17 -4 + -3x + x2 + -1((-3 * 7 + x * 7) + x(-3 + x)) = -7x + 17 -4 + -3x + x2 + -1((-21 + 7x) + x(-3 + x)) = -7x + 17 -4 + -3x + x2 + -1(-21 + 7x + (-3 * x + x * x)) = -7x + 17 -4 + -3x + x2 + -1(-21 + 7x + (-3x + x2)) = -7x + 17 Combine like terms: 7x + -3x = 4x -4 + -3x + x2 + -1(-21 + 4x + x2) = -7x + 17 -4 + -3x + x2 + (-21 * -1 + 4x * -1 + x2 * -1) = -7x + 17 -4 + -3x + x2 + (21 + -4x + -1x2) = -7x + 17 Reorder the terms: -4 + 21 + -3x + -4x + x2 + -1x2 = -7x + 17 Combine like terms: -4 + 21 = 17 17 + -3x + -4x + x2 + -1x2 = -7x + 17 Combine like terms: -3x + -4x = -7x 17 + -7x + x2 + -1x2 = -7x + 17 Combine like terms: x2 + -1x2 = 0 17 + -7x + 0 = -7x + 17 17 + -7x = -7x + 17 Reorder the terms: 17 + -7x = 17 + -7x Add '-17' to each side of the equation. 17 + -17 + -7x = 17 + -17 + -7x Combine like terms: 17 + -17 = 0 0 + -7x = 17 + -17 + -7x -7x = 17 + -17 + -7x Combine like terms: 17 + -17 = 0 -7x = 0 + -7x -7x = -7x Add '7x' to each side of the equation. -7x + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 0 = -7x + 7x Combine like terms: -7x + 7x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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