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y in (-oo:+oo)
3*y+14/5 = 7*y-(1/5) // - 7*y-(1/5)
3*y-(7*y)+14/5+1/5 = 0
3*y-7*y+14/5+1/5 = 0
3-4*y = 0 // - 3
-4*y = -3 // : -4
y = -3/(-4)
y = 3/4
y = 3/4
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