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y in (-oo:+oo)
4*y+4/5 = 7*y-(1/5) // - 7*y-(1/5)
4*y-(7*y)+4/5+1/5 = 0
4*y-7*y+4/5+1/5 = 0
1-3*y = 0 // - 1
-3*y = -1 // : -3
y = -1/(-3)
y = 1/3
y = 1/3
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