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^2 = 0
t = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1-(2/t)-(35/(t^2)) = 0
1-2*t^-1-35*t^-2 = 0
t_1 = t^-1
1-35*t_1^2-2*t_1^1 = 0
1-35*t_1^2-2*t_1 = 0
DELTA = (-2)^2-(-35*1*4)
DELTA = 144
DELTA > 0
t_1 = (144^(1/2)+2)/(-35*2) or t_1 = (2-144^(1/2))/(-35*2)
t_1 = -1/5 or t_1 = 1/7
t_1 = -1/5
t^-1+1/5 = 0
1*t^-1 = -1/5 // : 1
t^-1 = -1/5
-1 < 0
1/(t^1) = -1/5 // * t^1
1 = -1/5*t^1 // : -1/5
-5 = t^1
t = -5
t_1 = 1/7
t^-1-1/7 = 0
1*t^-1 = 1/7 // : 1
t^-1 = 1/7
-1 < 0
1/(t^1) = 1/7 // * t^1
1 = 1/7*t^1 // : 1/7
7 = t^1
t = 7
t in { -5, 7 }
| Ln=1.6873 | | -200x*2x= | | 2x+5=+15+4 | | e=1/6πv^2r | | q=a((5.3)) | | 6x=y^2-6y+39 | | (X)48=-18 | | 9p-22=-31+8p | | 24-(15x-1)= | | -7(15+h)=56 | | 2(-3x+4)-x=1x | | b/r-t/r=1 | | 4x-2y+8x=10y | | 8(3c-9)= | | ((3v^4y^5)/(15vw^2-9v^4)) | | 2.5=-0.2x(x-13.5) | | 5(p+8)= | | -0.2x^2+2.7x-2.5=0 | | x+y=3y-10 | | z^6+iz^3+i-1=0 | | 150=50x | | 195=39x | | 5(x)+5(x+3)=225 | | 3(2x+x)=2700 | | 5a-5+2a-7= | | 2x+x*3=2700 | | x^06=0.75 | | 10*x+6*(0.8-t)=6 | | 2x^2-5x+28=0 | | 6lny=3lne^2-9lnx | | x+y+6+5x+2y=180 | | 15d^-5/5d^-8 |