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D( x )
2*x-9 = 0
2*x-9 = 0
2*x-9 = 0
2*x-9 = 0 // + 9
2*x = 9 // : 2
x = 9/2
x in (-oo:9/2) U (9/2:+oo)
Y = 7/(2*x-9) // - 7/(2*x-9)
Y-(7/(2*x-9)) = 0
Y-7*(2*x-9)^-1 = 0
Y-7/(2*x-9) = 0
(Y*(2*x-9))/(2*x-9)-7/(2*x-9) = 0
Y*(2*x-9)-7 = 0
2*Y*x-9*Y-7 = 0
(2*Y*x-9*Y-7)/(2*x-9) = 0
(2*Y*x-9*Y-7)/(2*x-9) = 0 // * 2*x-9
2*Y*x-9*Y-7 = 0
2*Y*x-9*Y-7 = 0 // + -9*Y-7
2*Y*x = -(-9*Y-7) // : 2*Y
x = (-(-9*Y-7))/(2*Y)
x = (7-(-9*Y))/(2*Y)
x = (7-(-9*Y))/(2*Y)
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