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a in (-oo:+oo)
a/12 = 33/36 // - 33/36
a/12-(33/36) = 0
a/12-11/12 = 0
1/12*a-11/12 = 0 // + 11/12
1/12*a = 11/12 // : 1/12
a = 11/12/1/12
a = 11
a = 11
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