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b in (-oo:+oo)
72 = (1/3)*b // - (1/3)*b
72-((1/3)*b) = 0
(-1/3)*b+72 = 0
72-1/3*b = 0 // - 72
-1/3*b = -72 // : -1/3
b = -72/(-1/3)
b = 216
b = 216
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