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y in (-oo:+oo)
(2*y-1)/4 = y-3 // - y-3
(2*y-1)/4-y+3 = 0
(2*y-1)/4+(4*(-y))/4+(3*4)/4 = 0
2*y+4*(-y)+3*4-1 = 0
12-2*y-1 = 0
11-2*y = 0
(11-2*y)/4 = 0
(11-2*y)/4 = 0 // * 4
11-2*y = 0
11-2*y = 0 // - 11
-2*y = -11 // : -2
y = -11/(-2)
y = 11/2
y = 11/2
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