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n in (-oo:+oo)
n/4 = 49/7 // - 49/7
n/4-(49/7) = 0
n/4-7 = 0
1/4*n-7 = 0 // + 7
1/4*n = 7 // : 1/4
n = 7/1/4
n = 28
n = 28
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