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n in (-oo:+oo)
140/40 = n/50 // - n/50
140/40-(n/50) = 0
7/2-1/50*n = 0 // - 7/2
-1/50*n = -7/2 // : -1/50
n = -7/2/(-1/50)
n = 175
n = 175
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