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B in (-oo:+oo)
B/4.2 = 0.357142857143 // - 0.357142857143
B/4.2-0.357142857143 = 0
0.23809524*B-0.357142857143 = 0 // + 0.357142857143
0.23809524*B = 0.357142857143 // : 0.23809524
B = 0.357142857143/0.23809524
B = 1.49999999
B = 1.49999999
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