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n in (-oo:+oo)
(-6/7)*n+2/5 = -6/35 // + -6/35
(-6/7)*n+2/5-(-6/35) = 0
(-6/7)*n+2/5+6/35 = 0
4/7-6/7*n = 0 // - 4/7
-6/7*n = -4/7 // : -6/7
n = -4/7/(-6/7)
n = 2/3
n = 2/3
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