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b in (-oo:+oo)
9 = b/5.1 // - b/5.1
9-(b/5.1) = 0
9-0.19607843*b = 0
9-0.19607843*b = 0 // - 9
-0.19607843*b = -9 // : -0.19607843
b = -9/(-0.19607843)
b = 45.90000032
b = 45.90000032
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