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y in (-oo:+oo)
4*y+13/5 = 8*y-(1/15) // - 8*y-(1/15)
4*y-(8*y)+13/5+1/15 = 0
4*y-8*y+13/5+1/15 = 0
8/3-4*y = 0 // - 8/3
-4*y = -8/3 // : -4
y = -8/3/(-4)
y = 2/3
y = 2/3
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