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b in (-oo:+oo)
-12 = b/2-5 // - b/2-5
5-(b/2)-12 = 0
-1/2*b-7 = 0 // + 7
-1/2*b = 7 // : -1/2
b = 7/(-1/2)
b = -14
b = -14
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