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b in (-oo:+oo)
b/7.5 = 2.8 // - 2.8
b/7.5-2.8 = 0
0.13333333*b-2.8 = 0 // + 2.8
0.13333333*b = 2.8 // : 0.13333333
b = 2.8/0.13333333
b = 21.00000053
b = 21.00000053
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