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)
9/300 = 252/x // - 252/x
9/300-(252/x) = 0
9/300-252*x^-1 = 0
-252*x^-1 = -3/100 // : -252
x^-1 = 1/8400
-1 < 0
1/(x^1) = 1/8400 // * x^1
1 = 1/8400*x^1 // : 1/8400
8400 = x^1
x = 8400
x = 8400
| 245(2x-y)=30 | | b-2(b-14)=3b | | X+1=-100 | | 4x/9x/2 | | t^2+7t=11 | | 90/100=x/8917 | | -2m^2+12m+74=0 | | 6(d-73)=96 | | -5(x+4)-3(x-1)=-2(3-x)+15 | | (7x-54)=(8x-24) | | (5u-8)(7-u)=0 | | 35=((4x+50)-(3x+20)) | | X-47=92 | | (2AB)(3A)(5A)(7AB)= | | 8x-0.66(9x-6)=6 | | f(x)=10*2x | | 38=5t-27 | | 4w-16=4 | | 3=m/3-1 | | 2s-14=2 | | ?*15/2 | | 9+15+3= | | x+0.08875(x)=600 | | 8z-58=358 | | x+0.08375(x)=1396 | | 3x+3y+2x-y= | | x+0.07(x)=600 | | z=5+2*1.73 | | x+0.07(x)=1396 | | K-12=-12 | | 4(v-7)= | | x+0.07(x)=1299 |