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n in (-oo:+oo)
60/7 = (-3/7)*n+3*n+6 // - (-3/7)*n+3*n+6
60/7-((-3/7)*n)-(3*n)-6 = 0
(3/7)*n-3*n+60/7-6 = 0
18/7-18/7*n = 0 // - 18/7
-18/7*n = -18/7 // : -18/7
n = -18/7/(-18/7)
n = 1
n = 1
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