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b in (-oo:+oo)
(7/8)*(4*b-8) = -2 // + 2
(7/8)*(4*b-8)+2 = 0
7/8*(4*b-8)+2 = 0
7/8*(4*b-8)+2 = 0
7/2*b-5 = 0
7/2*b-5 = 0
7/2*b-5 = 0 // + 5
7/2*b = 5 // : 7/2
b = 5/7/2
b = 10/7
b = 10/7
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