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D( x )
2*x-3 = 0
2*x+3 = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x in (-oo:-3/2) U (-3/2:3/2) U (3/2:+oo)
36/(2*x-3) = 7/(2*x+3) // - 7/(2*x+3)
36/(2*x-3)-(7/(2*x+3)) = 0
36/(2*x-3)-7*(2*x+3)^-1 = 0
36/(2*x-3)-7/(2*x+3) = 0
(36*(2*x+3))/((2*x-3)*(2*x+3))+(-7*(2*x-3))/((2*x-3)*(2*x+3)) = 0
36*(2*x+3)-7*(2*x-3) = 0
58*x+129 = 0
(58*x+129)/((2*x-3)*(2*x+3)) = 0
(58*x+129)/((2*x-3)*(2*x+3)) = 0 // * (2*x-3)*(2*x+3)
58*x+129 = 0
58*x+129 = 0 // - 129
58*x = -129 // : 58
x = -129/58
x = -129/58
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