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D( w )
8*w-7 = 0
4*w+7 = 0
8*w-7 = 0
8*w-7 = 0
8*w-7 = 0 // + 7
8*w = 7 // : 8
w = 7/8
4*w+7 = 0
4*w+7 = 0
4*w+7 = 0 // - 7
4*w = -7 // : 4
w = -7/4
w in (-oo:-7/4) U (-7/4:7/8) U (7/8:+oo)
(6*w+5)/(8*w-7) = (3*w-3)/(4*w+7) // - (3*w-3)/(4*w+7)
(6*w+5)/(8*w-7)-((3*w-3)/(4*w+7)) = 0
(6*w+5)/(8*w-7)+(-1*(3*w-3))/(4*w+7) = 0
((6*w+5)*(4*w+7))/((8*w-7)*(4*w+7))+(-1*(3*w-3)*(8*w-7))/((8*w-7)*(4*w+7)) = 0
(6*w+5)*(4*w+7)-1*(3*w-3)*(8*w-7) = 0
107*w+14 = 0
(107*w+14)/((8*w-7)*(4*w+7)) = 0
(107*w+14)/((8*w-7)*(4*w+7)) = 0 // * (8*w-7)*(4*w+7)
107*w+14 = 0
107*w+14 = 0 // - 14
107*w = -14 // : 107
w = -14/107
w = -14/107
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