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y in (-oo:+oo)
13*y = 1/12 // - 1/12
13*y-(1/12) = 0
13*y-1/12 = 0
13*y-1/12 = 0 // + 1/12
13*y = 1/12 // : 13
y = 1/12/13
y = 1/156
y = 1/156
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