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n in (-oo:+oo)
25/100 = n/124 // - n/124
25/100-(n/124) = 0
1/4-1/124*n = 0 // - 1/4
-1/124*n = -1/4 // : -1/124
n = -1/4/(-1/124)
n = 31
n = 31
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