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)
900/x-50 = 250 // - 250
900/x-250-50 = 0
900*x^-1 = 300 // : 900
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
| x/8=30 | | 377+x=758 | | x*35-305=605 | | x(10-x)=2(5x-2x) | | x*17=425 | | x-438=147 | | 9x^4+6x^3+x^2=0 | | [7(x+4)-15]-[2(x-3)+2]= | | 100-x=96 | | 3y^2-8y+11=0 | | 3x+2/5x-1=11/14 | | x+7-8x/2=17/3-5x/2 | | -16-6=12-10x | | x+7-8x/3=17/3-5x/2 | | x+7-8x/3=17/7-5x/2 | | 4y+10/3=52/3-2y | | x^2-3xy+y^3=7 | | 20logx=40 | | x^3-24x^2+144x-8=0 | | 5=-2a | | 8x+9/3=19 | | 40+4y-16=13y-12y-3y | | 7x-2=2x+1 | | 6x+29=3x+107 | | 14.7-7y=3.5 | | 13*325= | | x^2-14x-85=0 | | x^2-xy-2x+3y=11 | | x^4-8x+4=0 | | y=4x-6x^2 | | 3x^2-x-24y^2+5x-15y=0 | | -14x-20=-12+70 |