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y in (-oo:+oo)
y/2 = y+3/10 // - y+3/10
y/2-y-(3/10) = 0
y/2-y-3/10 = 0
-1/2*y-3/10 = 0 // + 3/10
-1/2*y = 3/10 // : -1/2
y = 3/10/(-1/2)
y = -3/5
y = -3/5
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