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n in (-oo:+oo)
(-2/7)*n-(1/2) = -47/14 // + -47/14
(-2/7)*n-(1/2)-(-47/14) = 0
(-2/7)*n-1/2+47/14 = 0
20/7-2/7*n = 0 // - 20/7
-2/7*n = -20/7 // : -2/7
n = -20/7/(-2/7)
n = 10
n = 10
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