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n in (-oo:+oo)
2/3-(3*n) = (3/7)*n-(70/3) // - (3/7)*n-(70/3)
2/3-(3*n)-((3/7)*n)+70/3 = 0
(-3/7)*n-3*n+2/3+70/3 = 0
24-24/7*n = 0 // - 24
-24/7*n = -24 // : -24/7
n = -24/(-24/7)
n = 7
n = 7
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