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D( x )
3*x-7 = 0
3*x+1 = 0
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:7/3) U (7/3:+oo)
-5/(3*x-7) = 3/(3*x+1) // - 3/(3*x+1)
-5/(3*x-7)-(3/(3*x+1)) = 0
-5/(3*x-7)-3*(3*x+1)^-1 = 0
-5/(3*x-7)-3/(3*x+1) = 0
(-5*(3*x+1))/((3*x-7)*(3*x+1))+(-3*(3*x-7))/((3*x-7)*(3*x+1)) = 0
-5*(3*x+1)-3*(3*x-7) = 0
16-24*x = 0
(16-24*x)/((3*x-7)*(3*x+1)) = 0
(16-24*x)/((3*x-7)*(3*x+1)) = 0 // * (3*x-7)*(3*x+1)
16-24*x = 0
16-24*x = 0 // - 16
-24*x = -16 // : -24
x = -16/(-24)
x = 2/3
x = 2/3
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