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^4 = 0
t^4 = 0
t^4 = 0
1*t^4 = 0 // : 1
t^4 = 0
t = 0
t in (-oo:0) U (0:+oo)
6/(t^4) = 42/77 // - 42/77
6/(t^4)-(42/77) = 0
6/(t^4)-6/11 = 0
6*t^-4 = 6/11 // : 6
t^-4 = 1/11
-4 < 0
1/(t^4) = 1/11 // * t^4
1 = 1/11*t^4 // : 1/11
11 = t^4
t^4 = 11 // ^ 1/4
abs(t) = 11^(1/4)
t = 11^(1/4) or t = -11^(1/4)
t in { 11^(1/4), -11^(1/4) }
| -12.2+-4.55= | | 6x^2-14x-80=0 | | 37=5-4h | | -84-12= | | 37=5-h | | 2b-3b+9+5= | | 1/4=4x/5=11/20 | | 3y/7 | | -22fg-4f-9fg-5f= | | -7/8x=35 | | 1-4b-6=9 | | x^7+5=x+8 | | 4=.2y | | x/2-1=24 | | 10x-4=8x+8 | | -16=u(u+8) | | 4(2x+1)+1=3(x+5) | | 5x=-(15/8) | | 12-0.15= | | 7(a+3)-3(a+2)=-9 | | 7y+5y=180 | | 5f+3+6g-2f+3g-7= | | 6(3m+5)=2(4x-21) | | 10a^2=45a | | 11-960= | | 4=6a | | 3x^2+2x-27=0 | | 1/10^2 | | 3(X+4)+5Y=1 | | 359-370= | | Sinx*tanx=3sinx | | 2a=a+6 |