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y in (-oo:+oo)
3*y+2/5 = 6*y-(3/10) // - 6*y-(3/10)
3*y-(6*y)+2/5+3/10 = 0
3*y-6*y+2/5+3/10 = 0
7/10-3*y = 0 // - 7/10
-3*y = -7/10 // : -3
y = -7/10/(-3)
y = 7/30
y = 7/30
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