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y in (-oo:+oo)
7/8 = y/9 // - y/9
7/8-(y/9) = 0
7/8-1/9*y = 0 // - 7/8
-1/9*y = -7/8 // : -1/9
y = -7/8/(-1/9)
y = 63/8
y = 63/8
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