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y in (-oo:+oo)
-4/5 = (-2/3)*y-(5/4) // - (-2/3)*y-(5/4)
5/4-((-2/3)*y)-4/5 = 0
(2/3)*y-4/5+5/4 = 0
2/3*y+9/20 = 0 // - 9/20
2/3*y = -9/20 // : 2/3
y = -9/20/2/3
y = -27/40
y = -27/40
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