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y in (-oo:+oo)
16/7 = 8*y // - 8*y
16/7-(8*y) = 0
16/7-8*y = 0
16/7-8*y = 0 // - 16/7
-8*y = -16/7 // : -8
y = -16/7/(-8)
y = 2/7
y = 2/7
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