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n in (-oo:+oo)
(-2/7)*n-(2/3) = -46/63 // + -46/63
(-2/7)*n-(2/3)-(-46/63) = 0
(-2/7)*n-2/3+46/63 = 0
4/63-2/7*n = 0 // - 4/63
-2/7*n = -4/63 // : -2/7
n = -4/63/(-2/7)
n = 2/9
n = 2/9
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