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y in (-oo:+oo)
(2/5)*y-(1/3) = (4/3)*y-(1/9) // - (4/3)*y-(1/9)
(2/5)*y-((4/3)*y)-(1/3)+1/9 = 0
(2/5)*y+(-4/3)*y-1/3+1/9 = 0
-14/15*y-2/9 = 0 // + 2/9
-14/15*y = 2/9 // : -14/15
y = 2/9/(-14/15)
y = -5/21
y = -5/21
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