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 = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(1/3) = 5/x // - 5/x
7/x-(5/x)-(1/3) = 0
7/x-5*x^-1-1/3 = 0
2*x^-1 = 1/3 // : 2
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
| m-40=47 | | X+72=90 | | 139/9-3/9 | | 7-(-2y)+y-9= | | 14-3/9 | | (1/x+3)+(1/x+8)=1 | | f(x)=-4x^2+6x+7 | | 2(x-8)=48 | | (x/3)+(3/5)=(5/6) | | 13/4+7/8+1/4+7/8+23/4+1/2 | | -48=6(2+v) | | 5y-15=25 | | a^-2-b^-2/a^2-b^2 | | 3z^2-z-1=0 | | -3z^2+z+1=0 | | -4a^2-4a+7=0 | | -18=4 | | 3(2x-5x)=x+45 | | 24=4x-16 | | 0.04x^2-0.04x-0.01=0 | | 93/5+1218/25 | | 6-2x=90 | | 0.02y^2-0.01y-0.02=0 | | 108=72h | | -2x+18=7x | | -2x^2=-800 | | 7a-4=3a+56 | | -10+1/2x=25 | | y^2-y-7=0 | | y^2+5y+2=0 | | 6(2x-8)=2(6x+5) | | 2(4s-9)=-33-6s |