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y in (-oo:+oo)
y/8 = 13/7 // - 13/7
y/8-(13/7) = 0
y/8-13/7 = 0
1/8*y-13/7 = 0 // + 13/7
1/8*y = 13/7 // : 1/8
y = 13/7/1/8
y = 104/7
y = 104/7
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