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n in (-oo:+oo)
n/4 = 4/9 // - 4/9
n/4-(4/9) = 0
n/4-4/9 = 0
1/4*n-4/9 = 0 // + 4/9
1/4*n = 4/9 // : 1/4
n = 4/9/1/4
n = 16/9
n = 16/9
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