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n in (-oo:+oo)
(2/3)*n+4/5 = 3/10 // - 3/10
(2/3)*n+4/5-(3/10) = 0
(2/3)*n+4/5-3/10 = 0
2/3*n+1/2 = 0 // - 1/2
2/3*n = -1/2 // : 2/3
n = -1/2/2/3
n = -3/4
n = -3/4
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