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n in (-oo:+oo)
(-3/5)*n-(2/3) = -23/21 // + -23/21
(-3/5)*n-(2/3)-(-23/21) = 0
(-3/5)*n-2/3+23/21 = 0
3/7-3/5*n = 0 // - 3/7
-3/5*n = -3/7 // : -3/5
n = -3/7/(-3/5)
n = 5/7
n = 5/7
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