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y in (-oo:+oo)
(5*12)/18-(7*y) = 1 // - 1
(5*12)/18-(7*y)-1 = 0
(5*12)/18-7*y-1 = 0
7/3-7*y = 0 // - 7/3
-7*y = -7/3 // : -7
y = -7/3/(-7)
y = 1/3
y = 1/3
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