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n in (-oo:+oo)
(-5/7)*n-2 = 2*n-(90/7) // - 2*n-(90/7)
(-5/7)*n-(2*n)+90/7-2 = 0
(-5/7)*n-2*n+90/7-2 = 0
76/7-19/7*n = 0 // - 76/7
-19/7*n = -76/7 // : -19/7
n = -76/7/(-19/7)
n = 4
n = 4
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