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y in (-oo:+oo)
(9*(y-6))/2 = -2*y // + -2*y
(9*(y-6))/2-(-2*y) = 0
(9*(y-6))/2+2*y = 0
(9*(y-6))/2+(2*2*y)/2 = 0
9*(y-6)+2*2*y = 0
13*y-54 = 0
(13*y-54)/2 = 0
(13*y-54)/2 = 0 // * 2
13*y-54 = 0
13*y-54 = 0 // + 54
13*y = 54 // : 13
y = 54/13
y = 54/13
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