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n in (-oo:+oo)
n/22 = 63/154 // - 63/154
n/22-(63/154) = 0
n/22-9/22 = 0
1/22*n-9/22 = 0 // + 9/22
1/22*n = 9/22 // : 1/22
n = 9/22/1/22
n = 9
n = 9
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