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y in (-oo:+oo)
(3/8)*(12-(2*y))-3 = (5/4)*y // - (5/4)*y
(3/8)*(12-(2*y))-((5/4)*y)-3 = 0
(3/8)*(12-2*y)+(-5/4)*y-3 = 0
3/8*(12-2*y)+(-5*y)/4-3 = 0
(3/8*4*(12-2*y))/4+(-5*y)/4+(-3*4)/4 = 0
3/8*4*(12-2*y)-5*y-3*4 = 0
18-8*y-12 = 0
6-8*y = 0
(6-8*y)/4 = 0
(6-8*y)/4 = 0 // * 4
6-8*y = 0
6-8*y = 0 // - 6
-8*y = -6 // : -8
y = -6/(-8)
y = 3/4
y = 3/4
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