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