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y in (-oo:+oo)
(9/10)*y-1 = (-19/20)*y+4 // - (-19/20)*y+4
(9/10)*y-((-19/20)*y)-4-1 = 0
(9/10)*y+(19/20)*y-4-1 = 0
37/20*y-5 = 0 // + 5
37/20*y = 5 // : 37/20
y = 5/37/20
y = 100/37
y = 100/37
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