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)
12/t = 4 // - 4
12/t-4 = 0
12*t^-1 = 4 // : 12
t^-1 = 1/3
-1 < 0
1/(t^1) = 1/3 // * t^1
1 = 1/3*t^1 // : 1/3
3 = t^1
t = 3
t = 3
| 6p=-78 | | 3.75f+.5=6(.0625f-3) | | -16t^2-50*t+240=0 | | (6x+10)=(8x-4) | | w/4-7/12=w/3 | | .9d+.62(7000-d)=.21(2000) | | 20=4(j+4) | | 18x-1=14x-13 | | x^4-42x^2-59=0 | | 4(s)+20=54 | | -17-2=3x+12.25 | | (4x+28)=(7x-5) | | 3/4=15x | | 5y+2x=-15 | | v/3-4=v/5 | | 9+n+4=58 | | 342-k=-64(26k+48)-44k | | =6-x-17-2x | | (3a^3b^2)/(2a^-3b^0) | | 12w+15w-9+5=-3w | | 6x^6yz/2xy | | 3(5x+8)=-13+7 | | 7v-1/6=1-9v-9/5 | | ln(y-4)=2t | | 4*s+20=54 | | 3-1/x-6/x^2=0 | | 1/5divided1/15 | | 10-(4x+1)=8 | | 7x-1=mx-1 | | -2(5y-1)-y=-4y+12 | | 3.7x=2.4x+7.8 | | 3x+(x+6)=2x-(-12) |