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D( w )
6*w-7 = 0
3*w+7 = 0
6*w-7 = 0
6*w-7 = 0
6*w-7 = 0 // + 7
6*w = 7 // : 6
w = 7/6
3*w+7 = 0
3*w+7 = 0
3*w+7 = 0 // - 7
3*w = -7 // : 3
w = -7/3
w in (-oo:-7/3) U (-7/3:7/6) U (7/6:+oo)
(4*w+5)/(6*w-7) = (2*w-3)/(3*w+7) // - (2*w-3)/(3*w+7)
(4*w+5)/(6*w-7)-((2*w-3)/(3*w+7)) = 0
(4*w+5)/(6*w-7)+(-1*(2*w-3))/(3*w+7) = 0
((4*w+5)*(3*w+7))/((6*w-7)*(3*w+7))+(-1*(2*w-3)*(6*w-7))/((6*w-7)*(3*w+7)) = 0
(4*w+5)*(3*w+7)-1*(2*w-3)*(6*w-7) = 0
75*w+14 = 0
(75*w+14)/((6*w-7)*(3*w+7)) = 0
(75*w+14)/((6*w-7)*(3*w+7)) = 0 // * (6*w-7)*(3*w+7)
75*w+14 = 0
75*w+14 = 0 // - 14
75*w = -14 // : 75
w = -14/75
w = -14/75
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