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n in (-oo:+oo)
1/3 = n/4.2 // - n/4.2
1/3-(n/4.2) = 0
1/3-0.23809524*n = 0
1/3-0.23809524*n = 0 // - 1/3
-0.23809524*n = -1/3 // : -0.23809524
n = -1/3/(-0.23809524)
n = 1.39999997
n = 1.39999997
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