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b in (-oo:+oo)
15-((1/2)*b) = 47 // - 47
15-((1/2)*b)-47 = 0
(-1/2)*b-47+15 = 0
-1/2*b-32 = 0 // + 32
-1/2*b = 32 // : -1/2
b = 32/(-1/2)
b = -64
b = -64
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