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y in (-oo:+oo)
-2*y-(4/3) = (5/4)*y-(5/3) // - (5/4)*y-(5/3)
5/3-2*y-((5/4)*y)-(4/3) = 0
(-5/4)*y-2*y-4/3+5/3 = 0
1/3-13/4*y = 0 // - 1/3
-13/4*y = -1/3 // : -13/4
y = -1/3/(-13/4)
y = 4/39
y = 4/39
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