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n in (-oo:+oo)
-12.4 = n/(-7.9)+19.1 // - n/(-7.9)+19.1
-(n/(-7.9))-19.1-12.4 = 0
0.12658228*n-19.1-12.4 = 0
0.12658228*n-31.5 = 0 // + 31.5
0.12658228*n = 31.5 // : 0.12658228
n = 31.5/0.12658228
n = 248.84999701
n = 248.84999701
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