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y in (-oo:+oo)
4*y+3 = 8*y-(1/5) // - 8*y-(1/5)
4*y-(8*y)+1/5+3 = 0
4*y-8*y+1/5+3 = 0
16/5-4*y = 0 // - 16/5
-4*y = -16/5 // : -4
y = -16/5/(-4)
y = 4/5
y = 4/5
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