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