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)
700 = 20000/x // - 20000/x
700-(20000/x) = 0
700-20000*x^-1 = 0
-20000*x^-1 = -700 // : -20000
x^-1 = 7/200
-1 < 0
1/(x^1) = 7/200 // * x^1
1 = 7/200*x^1 // : 7/200
200/7 = x^1
x = 200/7
x = 200/7
| y=1x^2-6x+4 | | 2=k(3) | | 6x-10x=-24 | | 3(2x+1)=7x-(x-9) | | 4f+6=18 | | 10+4x-5x=x-(-2-2x) | | x+5y=49 | | a(a-x)+3a(x+2)-a(x-3a)= | | 3g-1=2 | | 10+4x-5=x-(-2-2x) | | D=a^2bc^3 | | 8cos^2x-9=0 | | 8(3x+1-2x)-3=2 | | 3y+1=83 | | 6(7x+4)=-3x | | 9-3y+12x= | | (n-2)*180=1260 | | 1/5x30 | | 7.5=2.5ln | | 3y(x-3)-2(x-3)= | | 3(x-6)=5x-20-2x | | 100-40x=180 | | 2(x+7)=5(x+5) | | 3x^2+13+12=0 | | 4y-36=72 | | 6(p+7)=38+7p | | -8(5x+9)=-5x | | 3x-7=74 | | 4-5x=x+10 | | 3.5n+1.5=8.5 | | cot(4x)=4/15 | | X-1/6=x/5 |