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b in (-oo:+oo)
b/8.9 = 10.2 // - 10.2
b/8.9-10.2 = 0
0.11235955*b-10.2 = 0 // + 10.2
0.11235955*b = 10.2 // : 0.11235955
b = 10.2/0.11235955
b = 90.78000045
b = 90.78000045
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