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b in (-oo:+oo)
8-((3/4)*b) = (6/8)*b-8 // - (6/8)*b-8
8-((3/4)*b)-((6/8)*b)+8 = 0
(-3/4)*b+(-3/4)*b+8+8 = 0
16-3/2*b = 0 // - 16
-3/2*b = -16 // : -3/2
b = -16/(-3/2)
b = 32/3
b = 32/3
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