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y in (-oo:+oo)
1/2-(((3/5)*y)/10) = 0
(-3/50)*y+1/2 = 0
1/2-3/50*y = 0 // - 1/2
-3/50*y = -1/2 // : -3/50
y = -1/2/(-3/50)
y = 25/3
y = 25/3
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