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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)
30/(2*x-3) = 6 // - 6
30/(2*x-3)-6 = 0
30/(2*x-3)+(-6*(2*x-3))/(2*x-3) = 0
30-6*(2*x-3) = 0
48-12*x = 0
(48-12*x)/(2*x-3) = 0
(48-12*x)/(2*x-3) = 0 // * 2*x-3
48-12*x = 0
48-12*x = 0 // - 48
-12*x = -48 // : -12
x = -48/(-12)
x = 4
x = 4
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