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b in (-oo:+oo)
(7/8)*b-3 = (-15/16)*b+2 // - (-15/16)*b+2
(7/8)*b-((-15/16)*b)-3-2 = 0
(7/8)*b+(15/16)*b-3-2 = 0
29/16*b-5 = 0 // + 5
29/16*b = 5 // : 29/16
b = 5/29/16
b = 80/29
b = 80/29
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