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y in (-oo:+oo)
(1/6)*y-y = 25 // - 25
(1/6)*y-y-25 = 0
-5/6*y-25 = 0 // + 25
-5/6*y = 25 // : -5/6
y = 25/(-5/6)
y = -30
y = -30
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