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y in (-oo:+oo)
(9-(2*y))/7 = y // - y
(9-(2*y))/7-y = 0
(9-2*y)/7-y = 0
(9-2*y)/7+(7*(-y))/7 = 0
7*(-y)-2*y+9 = 0
9-9*y = 0
(9-9*y)/7 = 0
(9-9*y)/7 = 0 // * 7
9-9*y = 0
9-9*y = 0 // - 9
-9*y = -9 // : -9
y = -9/(-9)
y = 1
y = 1
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