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)
3/x = 12/48 // - 12/48
3/x-(12/48) = 0
3/x-1/4 = 0
3*x^-1 = 1/4 // : 3
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
| 1+7(7k+5)=-111 | | x^4+3x^2+8x=0 | | J-3=1 | | 4(4x-2)=x-4 | | -3(5n-4)=-108 | | 10a+B=A+B+Ab | | 17=-4f+9 | | -8+a=8 | | 3x^2+5y^2-6x+10y+8=0 | | -7x-2=5x-0.4 | | 9y-27=12y+6 | | 10x=1-10 | | -5-6x=10x+27 | | x=1(1/12) | | 2x+3=-3x-11 | | 2.8+0.6x=0.4 | | 6a+6=4a+5 | | 1(1/12) | | -4(s+3)=-24 | | a+4=25 | | 3x-4=x-11 | | 3b-b=8 | | 3n-13=59 | | 6.2g+2=1.2g+32 | | 1508/7 | | 2-q=14 | | u^2-15u=0 | | s+1=6 | | 7+2m=-4m+7 | | 30-4x=-2 | | 5x+(-6)=-8 | | 5+2=3710 |