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y in (-oo:+oo)
y/13 = 17/7 // - 17/7
y/13-(17/7) = 0
y/13-17/7 = 0
1/13*y-17/7 = 0 // + 17/7
1/13*y = 17/7 // : 1/13
y = 17/7/1/13
y = 221/7
y = 221/7
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