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n in (-oo:+oo)
2-3*n-((3/7)*n) = 10/7 // - 10/7
2-3*n-((3/7)*n)-(10/7) = 0
(-3/7)*n-3*n-10/7+2 = 0
4/7-24/7*n = 0 // - 4/7
-24/7*n = -4/7 // : -24/7
n = -4/7/(-24/7)
n = 1/6
n = 1/6
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