If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/u-2 = 0
4*u^-1 = 2 // : 4
u^-1 = 1/2
-1 < 0
1/(u^1) = 1/2 // * u^1
1 = 1/2*u^1 // : 1/2
2 = u^1
u = 2
u = 2
| 12-5y=40 | | 11x+7-3x=-9 | | y+-428=-136 | | 252s+58s=7750 | | 6x-19=5x+9 | | 2(-3)-3(-9)=21 | | 30=1/4x=1/2x | | -12-5y=40 | | 2x+12-7x= | | 14x-7=11x+8 | | -1/7y-5/3=-3/2 | | 54x+62=190 | | 2(-3)-3(9)=21 | | 7x-6+6x+1=180 | | k-43=121 | | 3y+85=62 | | (3v-7)(5v^2-v-4)=0 | | -5/2=-3/5w-4/3 | | x^2+3y-39=0 | | 19m=209 | | 0=-16t^2+68t+60 | | 4x-72y=346 | | 5(1)+y=-25 | | (v^2-3v+4)(5v-2)=0 | | 5/2-1=-31 | | 32=4(u+3)-6u | | y+168=612 | | (x^2)-4=1-4x | | 2v-8=10 | | 5(u-4)-8u=-38 | | log((x^2)-4)=log(1-4x) | | 4y=10x-24 |