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