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y in (-oo:+oo)
(2/5)*y-8 = 9-((-3/5)*y) // - 9-((-3/5)*y)
(2/5)*y+(-3/5)*y-9-8 = 0
-1/5*y-17 = 0 // + 17
-1/5*y = 17 // : -1/5
y = 17/(-1/5)
y = -85
y = -85
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