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)
5/2 = 15/x // - 15/x
5/2-(15/x) = 0
5/2-15*x^-1 = 0
-15*x^-1 = -5/2 // : -15
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
| 200/4.5 | | 5x-20-4x-4= | | K+1=-28 | | 5y+8-12y=16-15y | | 5(4+2x)-1(8x+-12)=-68 | | 5(4+2x)1-(8x+-12)=-68 | | 18/16=63/m | | 9c=gal | | 6x+3=12-12y | | 5(4+2x)-(8x+-12)=-68 | | 2t^2+3t=20 | | B/4=100/10 | | (7/30)-(1/6) | | 2(x-1)+3=2x-1 | | t/20=900/30 | | 4v^5+v^4+20v=5 | | 4+10x-2=(x+9) | | 4/8=m/36 | | 12-2x=3x | | 9(8a-5)= | | 0.5*(3x-1)*5x=60 | | 5/7=42/x | | 2m-2=1+m | | 19+p=37 | | m+14=5 | | 15*x^2-5*x-120=0 | | P(x)=8-1600 | | 25a^2-20p+4= | | 5s-4=-1+6s | | x=5cosy | | 5n^2=-9n-4 | | 3/4-5/3 |