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b in (-oo:+oo)
55 = 10*(1/2)*b // - 10*(1/2)*b
55-(10*(1/2)*b) = 0
55-5*b = 0
55-5*b = 0 // - 55
-5*b = -55 // : -5
b = -55/(-5)
b = 11
b = 11
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