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b in (-oo:+oo)
2.5/35 = 2*b // - 2*b
2.5/35-(2*b) = 0
2.5/35-2*b = 0
0.07142857-2*b = 0 // - 0.07142857
-2*b = -0.07142857 // : -2
b = -0.07142857/(-2)
b = 0.03571429
b = 0.03571429
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