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y in (-oo:+oo)
13/17 = y/9 // - y/9
13/17-(y/9) = 0
13/17-1/9*y = 0 // - 13/17
-1/9*y = -13/17 // : -1/9
y = -13/17/(-1/9)
y = 117/17
y = 117/17
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