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y in (-oo:+oo)
(5*(y-3))/4 = 2*y+3 // - 2*y+3
(5*(y-3))/4-(2*y)-3 = 0
(5*(y-3))/4-2*y-3 = 0
(5*(y-3))/4+(-2*4*y)/4+(-3*4)/4 = 0
5*(y-3)-2*4*y-3*4 = 0
-3*y-15-12 = 0
-3*y-27 = 0
(-3*y-27)/4 = 0
(-3*y-27)/4 = 0 // * 4
-3*y-27 = 0
-3*y-27 = 0 // + 27
-3*y = 27 // : -3
y = 27/(-3)
y = -9
y = -9
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