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y in (-oo:+oo)
(2/3)*y-3 = (4/5)*y-5 // - (4/5)*y-5
(2/3)*y-((4/5)*y)-3+5 = 0
(2/3)*y+(-4/5)*y-3+5 = 0
2-2/15*y = 0 // - 2
-2/15*y = -2 // : -2/15
y = -2/(-2/15)
y = 15
y = 15
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