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b in (-oo:+oo)
5 = (1/3)*b // - (1/3)*b
5-((1/3)*b) = 0
(-1/3)*b+5 = 0
5-1/3*b = 0 // - 5
-1/3*b = -5 // : -1/3
b = -5/(-1/3)
b = 15
b = 15
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