(2+x)(x-7)
_______ =1
(x-5)(x+4)
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Answer: x = 3/2.
Step-by-step explanation:
(2 + x)(7 - x)/(5 - x)(4 + x) = 1
(2 + x)(7 - x) = (5 - x)(4 + x)
2 * 7 + 2 * (-x) + x * 7 + x * (-x) = 5 * 4 + 5 * x - x * 4 - x * x
14 - 2x + 7x - x^2 = 20 + 5x - 4x - x^2
14 + 5x - x^2 = 20 + x - x^2
5x - x^2 = 20 + x - x^2 - 14
5x - x^2 = -x^2 + x + 6
4x = 6
x = 6/4
x = 3/2.
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