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
-5*t-12 = 0
t = 0
t = 0
-5*t-12 = 0
-5*t-12 = 0
-5*t-12 = 0 // + 12
-5*t = 12 // : -5
t = 12/(-5)
t = -12/5
t in (-oo:-12/5) U (-12/5:0) U (0:+oo)
2/t = t/(-5*t-12) // - t/(-5*t-12)
2/t-(t/(-5*t-12)) = 0
(-1*t)/(-5*t-12)+2/t = 0
(-1*t^2)/(t*(-5*t-12))+(2*(-5*t-12))/(t*(-5*t-12)) = 0
2*(-5*t-12)-1*t^2 = 0
-t^2-10*t-24 = 0
-t^2-10*t-24 = 0
-1*(t^2+10*t+24) = 0
t^2+10*t+24 = 0
DELTA = 10^2-(1*4*24)
DELTA = 4
DELTA > 0
t = (4^(1/2)-10)/(1*2) or t = (-4^(1/2)-10)/(1*2)
t = -4 or t = -6
-1*(t+6)*(t+4) = 0
(-1*(t+6)*(t+4))/(t*(-5*t-12)) = 0
(-1*(t+6)*(t+4))/(t*(-5*t-12)) = 0 // * t*(-5*t-12)
-1*(t+6)*(t+4) = 0
( -1 )
-1 = 0
t belongs to the empty set
( t+4 )
t+4 = 0 // - 4
t = -4
( t+6 )
t+6 = 0 // - 6
t = -6
t in { -4, -6 }
| 9.1=0.35x | | -3(d-13)=-18 | | -28+4x=4(x-7) | | x+24.50=40.00 | | 2(x+3)+3x=5 | | 1+8x+16x=0 | | V/5.12=2 | | y*5=8 | | 5+2x-5x=10 | | 4(5x+5)=x-18 | | 7x+8-4x+2=34 | | (11)(13)= | | 3+2x^3=5 | | (4x-5)+(11x-10)=180 | | 6t-6=1 | | 7(-3)+15=10(-3)-9 | | x^4-3x^3-70x^2=0 | | g(3z)=x^2+6 | | 2/5x=4/5x | | 8x-41=4x+35 | | x+(x*0.145)=140 | | g^2+10g-144=0 | | 25+3x=7-3x | | 2.3k=9.3-0.7k | | 20-4n=-17n+15n-16 | | -7x+10y=-7 | | 4x-10=66 | | 12/9-1/2 | | 6y-15=17-2 | | 5x+6=101 | | 5(2)+12y=-1 | | 3x^3-6x^2-36x+24=0 |