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D( x )
3*x-7 = 0
4*x+1 = 0
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x in (-oo:-1/4) U (-1/4:7/3) U (7/3:+oo)
4/(3*x-7) = 5/(4*x+1) // - 5/(4*x+1)
4/(3*x-7)-(5/(4*x+1)) = 0
4/(3*x-7)-5*(4*x+1)^-1 = 0
4/(3*x-7)-5/(4*x+1) = 0
(4*(4*x+1))/((3*x-7)*(4*x+1))+(-5*(3*x-7))/((3*x-7)*(4*x+1)) = 0
4*(4*x+1)-5*(3*x-7) = 0
x+39 = 0
(x+39)/((3*x-7)*(4*x+1)) = 0
(x+39)/((3*x-7)*(4*x+1)) = 0 // * (3*x-7)*(4*x+1)
x+39 = 0
x+39 = 0 // - 39
x = -39
x = -39
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