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y in (-oo:+oo)
(9*(y-9))/2 = -3*y // + -3*y
(9*(y-9))/2-(-3*y) = 0
(9*(y-9))/2+3*y = 0
(9*(y-9))/2+(2*3*y)/2 = 0
9*(y-9)+2*3*y = 0
15*y-81 = 0
(15*y-81)/2 = 0
(15*y-81)/2 = 0 // * 2
15*y-81 = 0
15*y-81 = 0 // + 81
15*y = 81 // : 15
y = 81/15
y = 27/5
y = 27/5
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