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n in (-oo:+oo)
7.2/12 = n/3.6 // - n/3.6
7.2/12-(n/3.6) = 0
7.2/12-0.27777778*n = 0
0.6-0.27777778*n = 0 // - 0.6
-0.27777778*n = -0.6 // : -0.27777778
n = -0.6/(-0.27777778)
n = 2.15999998
n = 2.15999998
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