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