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y in (-oo:+oo)
(4/5)*y-2 = (-9/10)*y+3 // - (-9/10)*y+3
(4/5)*y-((-9/10)*y)-3-2 = 0
(4/5)*y+(9/10)*y-3-2 = 0
17/10*y-5 = 0 // + 5
17/10*y = 5 // : 17/10
y = 5/17/10
y = 50/17
y = 50/17
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