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y in (-oo:+oo)
y/12 = 7/13 // - 7/13
y/12-(7/13) = 0
y/12-7/13 = 0
1/12*y-7/13 = 0 // + 7/13
1/12*y = 7/13 // : 1/12
y = 7/13/1/12
y = 84/13
y = 84/13
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