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n in (-oo:+oo)
140 = 7*(6/2)*n // - 7*(6/2)*n
140-(7*(6/2)*n) = 0
140-21*n = 0
140-21*n = 0 // - 140
-21*n = -140 // : -21
n = -140/(-21)
n = 20/3
n = 20/3
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