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y in (-oo:+oo)
y/9 = 13/8 // - 13/8
y/9-(13/8) = 0
y/9-13/8 = 0
1/9*y-13/8 = 0 // + 13/8
1/9*y = 13/8 // : 1/9
y = 13/8/1/9
y = 117/8
y = 117/8
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