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((4÷x)+3)-((5÷x)-1)
(4÷x)+3-(5÷x)+1
(4÷x)+4-(5÷x)
((4+4x-5)÷x)
(-1+4x)÷x
= 4x - 4 - 5x - 15 / x² - x + 3x - 3
= -x - 19 / x² + 2x - 3