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y in (-oo:+oo)
-1/6 = (-8/21)*y // - (-8/21)*y
-((-8/21)*y)-1/6 = 0
(8/21)*y-1/6 = 0
8/21*y-1/6 = 0 // + 1/6
8/21*y = 1/6 // : 8/21
y = 1/6/8/21
y = 7/16
y = 7/16
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