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y in (-oo:+oo)
y/13 = 8/17 // - 8/17
y/13-(8/17) = 0
y/13-8/17 = 0
1/13*y-8/17 = 0 // + 8/17
1/13*y = 8/17 // : 1/13
y = 8/17/1/13
y = 104/17
y = 104/17
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