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b in (-oo:+oo)
8 = (2/3)*b-4 // - (2/3)*b-4
4-((2/3)*b)+8 = 0
(-2/3)*b+4+8 = 0
12-2/3*b = 0 // - 12
-2/3*b = -12 // : -2/3
b = -12/(-2/3)
b = 18
b = 18
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