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D( x )
2*x-7 = 0
7*x+7 = 0
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
7*x+7 = 0
7*x+7 = 0
7*x+7 = 0 // - 7
7*x = -7 // : 7
x = -7/7
x = -1
x in (-oo:-1) U (-1:7/2) U (7/2:+oo)
(6*x+5)/(2*x-7) = (21*x-4)/(7*x+7) // - (21*x-4)/(7*x+7)
(6*x+5)/(2*x-7)-((21*x-4)/(7*x+7)) = 0
(6*x+5)/(2*x-7)+(-1*(21*x-4))/(7*x+7) = 0
((6*x+5)*(7*x+7))/((2*x-7)*(7*x+7))+(-1*(21*x-4)*(2*x-7))/((2*x-7)*(7*x+7)) = 0
(6*x+5)*(7*x+7)-1*(21*x-4)*(2*x-7) = 0
232*x+7 = 0
(232*x+7)/((2*x-7)*(7*x+7)) = 0
(232*x+7)/((2*x-7)*(7*x+7)) = 0 // * (2*x-7)*(7*x+7)
232*x+7 = 0
232*x+7 = 0 // - 7
232*x = -7 // : 232
x = -7/232
x = -7/232
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