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n in (-oo:+oo)
n/7 = 33/21 // - 33/21
n/7-(33/21) = 0
n/7-11/7 = 0
1/7*n-11/7 = 0 // + 11/7
1/7*n = 11/7 // : 1/7
n = 11/7/1/7
n = 11
n = 11
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