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b in (-oo:+oo)
(4*b-3)/6-((2*b-5)/8) = (7*b)/16 // - (7*b)/16
(4*b-3)/6-((2*b-5)/8)-((7*b)/16) = 0
(4*b-3)/6-((2*b-5)/8)+(-7/16)*b = 0
(4*b-3)/6+(-1*(2*b-5))/8+(-7*b)/16 = 0
(8*16*(4*b-3))/(6*8*16)+(-1*6*16*(2*b-5))/(6*8*16)+(-7*6*8*b)/(6*8*16) = 0
8*16*(4*b-3)-1*6*16*(2*b-5)-7*6*8*b = 0
320*b-336*b+96 = 0
96-16*b = 0
(96-16*b)/(6*8*16) = 0
(96-16*b)/(6*8*16) = 0 // * 6*8*16
96-16*b = 0
96-16*b = 0 // - 96
-16*b = -96 // : -16
b = -96/(-16)
b = 6
b = 6
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