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y in (-oo:+oo)
(9/10)*y-2 = (19/20)*y+3 // - (19/20)*y+3
(9/10)*y-((19/20)*y)-3-2 = 0
(9/10)*y+(-19/20)*y-3-2 = 0
-1/20*y-5 = 0 // + 5
-1/20*y = 5 // : -1/20
y = 5/(-1/20)
y = -100
y = -100
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