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b in (-oo:+oo)
(-1/2)*b-2 = 10 // - 10
(-1/2)*b-10-2 = 0
-1/2*b-12 = 0 // + 12
-1/2*b = 12 // : -1/2
b = 12/(-1/2)
b = -24
b = -24
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