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n in (-oo:+oo)
1.5/0.03 = n/2.1 // - n/2.1
1.5/0.03-(n/2.1) = 0
1.5/0.03-0.47619048*n = 0
50-0.47619048*n = 0 // - 50
-0.47619048*n = -50 // : -0.47619048
n = -50/(-0.47619048)
n = 104.99999916
n = 104.99999916
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