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y in (-oo:+oo)
(2*y)/7 = 3*y-9 // - 3*y-9
(2*y)/7-(3*y)+9 = 0
(2*y)/7-3*y+9 = 0
9-19/7*y = 0 // - 9
-19/7*y = -9 // : -19/7
y = -9/(-19/7)
y = 63/19
y = 63/19
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