If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/5 = 10/x // - 10/x
4/5-(10/x) = 0
4/5-10*x^-1 = 0
-10*x^-1 = -4/5 // : -10
x^-1 = 2/25
-1 < 0
1/(x^1) = 2/25 // * x^1
1 = 2/25*x^1 // : 2/25
25/2 = x^1
x = 25/2
x = 25/2
| s+31/2s+20=74 | | -2y+5-y=25+y | | 20-8x=15+x | | 19+2x=31 | | -174x=-20 | | 2x+87=3x+6 | | X+17+4x=-33-4x-40 | | 3-3m=-4+2m | | 3n^2+14n+23=0 | | 2=6x-11 | | y=-1/3(2)-3 | | 2x+1-4=2x+3 | | a+11=35 | | 2y=10x+16 | | y=-1/3(1)-3 | | 9y-13-5y+8=0 | | 5x+4x+68=34-8x | | .0002x^2-.1x+12.6=0 | | -2x+1=-4 | | 6x-15-4x=33 | | 4a^3-2b^2+5= | | 15g-13g+14=0 | | 2x+17=4x-1 | | 10x-7=2x+33 | | 8x+6=9x-7 | | 31=3.1x | | 37=-3+(5x+6) | | 4x-2y=5.5 | | 17-n=5 | | 10x-3=53 | | 2y^3(y^3-28)=0 | | 10x-16-2x=8 |