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n in (-oo:+oo)
3*n+4/3 = 0.8*n+15 // - 0.8*n+15
3*n-(0.8*n)+4/3-15 = 0
3*n-0.8*n+4/3-15 = 0
2.2*n-41/3 = 0 // + 41/3
2.2*n = 41/3 // : 2.2
n = 41/3/2.2
n = 6.21212121
n = 6.21212121
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