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n in (-oo:+oo)
42/24 = n/4 // - n/4
42/24-(n/4) = 0
7/4-1/4*n = 0 // - 7/4
-1/4*n = -7/4 // : -1/4
n = -7/4/(-1/4)
n = 7
n = 7
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