If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1 = 2/t // - 2/t
1-(2/t) = 0
1-2*t^-1 = 0
-2*t^-1 = -1 // : -2
t^-1 = 1/2
-1 < 0
1/(t^1) = 1/2 // * t^1
1 = 1/2*t^1 // : 1/2
2 = t^1
t = 2
t = 2
| -7x+18=-13x-20 | | 5x-17-4x=1 | | -7x+18=-13-20 | | -2+4+(-6)=x | | 4s-2s=10 | | 12y+2y=6 | | -(6x-1)+4x-4=-3 | | 81=6+5x | | v+14=5 | | Y=4+(-10)+(-2) | | 3x=9b | | V^2+8=13 | | 10+5p=35 | | 4x+45=69 | | 16x+7=-7x-14 | | (x^5-y^2)*dx+2xy*dy=0 | | Mn=14 | | 3=5cos(2x+1)-1 | | -15x+15=15x-11 | | 5a-a-8=2a+26 | | 3x-(-8x)=-99 | | r^(2/3)=4 | | 4b(5b^2+b+6)= | | (8z-4)(5z+10)=0 | | 2x+3x=29 | | r92/30=4 | | (-1+8i)+(8-50i)=0 | | 4/9x=5/9 | | 5(p+2)=35 | | x+2x+2x-5=180 | | (-1-8i)+(8-50i)=0 | | 5n+6=5(n+1) |