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y in (-oo:+oo)
12/10 = 42*y // - 42*y
12/10-(42*y) = 0
12/10-42*y = 0
6/5-42*y = 0 // - 6/5
-42*y = -6/5 // : -42
y = -6/5/(-42)
y = 1/35
y = 1/35
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