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b in (-oo:+oo)
15-((1/2)*b) = 3 // - 3
15-((1/2)*b)-3 = 0
(-1/2)*b-3+15 = 0
12-1/2*b = 0 // - 12
-1/2*b = -12 // : -1/2
b = -12/(-1/2)
b = 24
b = 24
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