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n in (-oo:+oo)
8.3 = n/10 // - n/10
8.3-(n/10) = 0
8.3-1/10*n = 0 // - 8.3
-1/10*n = -8.3 // : -1/10
n = -8.3/(-1/10)
n = 83
n = 83
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