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D( x )
2*x-3 = 0
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:+oo)
7 = (3*x)/(2*x-3) // - (3*x)/(2*x-3)
7-((3*x)/(2*x-3)) = 0
7-3*x*(2*x-3)^-1 = 0
(-3*x)/(2*x-3)+7 = 0
(-3*x)/(2*x-3)+(7*(2*x-3))/(2*x-3) = 0
7*(2*x-3)-3*x = 0
11*x-21 = 0
(11*x-21)/(2*x-3) = 0
(11*x-21)/(2*x-3) = 0 // * 2*x-3
11*x-21 = 0
11*x-21 = 0 // + 21
11*x = 21 // : 11
x = 21/11
x = 21/11
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