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n in (-oo:+oo)
(3/5)*n+6/7 = 81/70 // - 81/70
(3/5)*n+6/7-(81/70) = 0
(3/5)*n+6/7-81/70 = 0
3/5*n-3/10 = 0 // + 3/10
3/5*n = 3/10 // : 3/5
n = 3/10/3/5
n = 1/2
n = 1/2
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