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D( y )
2*y-1 = 0
2*y-1 = 0
2*y-1 = 0
2*y-1 = 0 // + 1
2*y = 1 // : 2
y = 1/2
y in (-oo:1/2) U (1/2:+oo)
(5*y)/(2*y-1)-3 = 12/(2*y-1) // - 12/(2*y-1)
(5*y)/(2*y-1)-(12/(2*y-1))-3 = 0
(5*y)/(2*y-1)-12*(2*y-1)^-1-3 = 0
(5*y)/(2*y-1)-12/(2*y-1)-3 = 0
(5*y)/(2*y-1)-12/(2*y-1)+(-3*(2*y-1))/(2*y-1) = 0
5*y-3*(2*y-1)-12 = 0
5*y-6*y-12+3 = 0
-y-9 = 0
(-y-9)/(2*y-1) = 0
(-y-9)/(2*y-1) = 0 // * 2*y-1
-y-9 = 0
-y-9 = 0 // + 9
-y = 9 // * -1
y = -9
y = -9
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