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y in (-oo:+oo)
(12*y-18)/6 = (4*y)/3 // - (4*y)/3
(12*y-18)/6-((4*y)/3) = 0
(12*y-18)/6+(-4/3)*y = 0
(12*y-18)/6+(-4*y)/3 = 0
(3*(12*y-18))/(3*6)+(-4*6*y)/(3*6) = 0
3*(12*y-18)-4*6*y = 0
12*y-54 = 0
(12*y-54)/(3*6) = 0
(12*y-54)/(3*6) = 0 // * 3*6
12*y-54 = 0
12*y-54 = 0 // + 54
12*y = 54 // : 12
y = 54/12
y = 9/2
y = 9/2
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