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y in (-oo:+oo)
-2/3 = y/6 // - y/6
-(y/6)-2/3 = 0
-1/6*y-2/3 = 0 // + 2/3
-1/6*y = 2/3 // : -1/6
y = 2/3/(-1/6)
y = -4
y = -4
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