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n in (-oo:+oo)
(2/7)*n-(1/2) = -27/70 // + -27/70
(2/7)*n-(1/2)-(-27/70) = 0
(2/7)*n-1/2+27/70 = 0
2/7*n-4/35 = 0 // + 4/35
2/7*n = 4/35 // : 2/7
n = 4/35/2/7
n = 2/5
n = 2/5
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