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y in (-oo:+oo)
y/12 = 77/84 // - 77/84
y/12-(77/84) = 0
y/12-11/12 = 0
1/12*y-11/12 = 0 // + 11/12
1/12*y = 11/12 // : 1/12
y = 11/12/1/12
y = 11
y = 11
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