If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x+1/x = 0
x = 0
x+1/x = 0
x+1/x = 0
1*x^1+1*x^-1 = 0
(1*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+1*x^0) = 0
x^1
x^2+1 = 0
x^2+1 = 0
DELTA = 0^2-(1*1*4)
DELTA = -4
DELTA < 0
x in { }
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x)/(x+1/x) = 0
(9*x)/(x+x^-1) = 0
x+x^-1 = 0
x^-1*(x^2+1) = 0
1*x^2 = -1 // : 1
x^2 = -1
1/x = 0
(9*x)/(x^-1) = 0
9*x = 0 // : 9
x = 0
x in { 0}
x belongs to the empty set
| 3x-8x+20=2x+27 | | 2/3(18x-12)=7-3(x-3) | | 8x=3(4)+8-3(2)/2(2)+2(2)(2) | | -4x-x=1-11 | | 9u+22=0 | | 6x+7=8x-7 | | 7(-3-8x)+1=-8x+28 | | 4u-6u=-12-2 | | 5x+90=3x+34 | | -5u-19=11 | | 4x=4-5 | | 3(x+9)=-2(4x-6)+2x | | 5t^2=20 | | 2x+9/-3=7/5 | | -5/6t=4 | | 8+2n=4n+2 | | (x/3)-(7x/12)=2/3 | | 0=7t-7 | | 3/4m+3=6 | | -10-[(9-3)-(-8-9)]= | | -6x+9x=1+20 | | -13+3=9w+w | | 7-6x-5-8x=4 | | r=4x+43x | | -4v-44=8(v-4) | | 3x*-2(x+6)=4x-(x-10) | | 2/5(x-1/3)+1/2(x+2)=7/10(x-4/7) | | f(X)=9-7 | | 7y-3y=3 | | 75m+3=6 | | 3(v+3)-8v=-1 | | 26=x/4+3x |