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b in (-oo:+oo)
b/51.4 = 5 // - 5
b/51.4-5 = 0
0.01945525*b-5 = 0 // + 5
0.01945525*b = 5 // : 0.01945525
b = 5/0.01945525
b = 257.00003855
b = 257.00003855
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