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b in (-oo:+oo)
13-(b/6) = 2-(0.5/4) // - 2-(0.5/4)
0.5/4-(b/6)-2+13 = 0
11.125-1/6*b = 0 // - 11.125
-1/6*b = -11.125 // : -1/6
b = -11.125/(-1/6)
b = 66.74999867
b = 66.74999867
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