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y in (-oo:+oo)
y/5 = 3/13 // - 3/13
y/5-(3/13) = 0
y/5-3/13 = 0
1/5*y-3/13 = 0 // + 3/13
1/5*y = 3/13 // : 1/5
y = 3/13/1/5
y = 15/13
y = 15/13
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