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n in (-oo:+oo)
(-2/7)*n+2/5 = (-4/7)*n+64/35 // - (-4/7)*n+64/35
(-2/7)*n-((-4/7)*n)+2/5-(64/35) = 0
(-2/7)*n+(4/7)*n+2/5-64/35 = 0
2/7*n-10/7 = 0 // + 10/7
2/7*n = 10/7 // : 2/7
n = 10/7/2/7
n = 5
n = 5
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