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)
3.5/20 = 10.5/x // - 10.5/x
3.5/20-(10.5/x) = 0
3.5/20-10.5*x^-1 = 0
-10.5*x^-1 = -0.175 // : -10.5
x^-1 = 0.01666667
-1 < 0
1/(x^1) = 0.01666667 // * x^1
1 = 0.01666667*x^1 // : 0.01666667
59.999988 = x^1
x = 59.999988
x = 59.999988
| x/20=14/56 | | 4+x-10=14 | | x-16=17+13 | | 31+1x=46 | | 31+1x=52 | | 18/x=17/102 | | 1/6+1/6b=1/2b | | g^2-2g=223 | | -26+1x=10 | | 5d^2-4d+2+0=0 | | 26+1x=52 | | 26+1x=57 | | 26+1x=37 | | 2+3(0.6x-0.02)=2(0.4x+0.3) | | 24=17-C | | 3(x-2)+4(2x-6)=6(2-4)+8(2x+1) | | 142-6x=21x+16 | | (m+8)+5= | | 90=n*5 | | PROVEA-(B-C)=(A-B)U(AnC) | | 2x^2+14=22 | | -2=13x-5 | | 47+1x=100 | | 47+1x=70 | | A-(B-C)=(A-B)U(AnC) | | 5w-5w+12+30= | | 8t^2-6t+9=0 | | 47=1x | | 4x-8+2(5x+1)=-2(x+5) | | 6f-8+6f-2f= | | 7X-5=2X+13 | | 12(x^4+7x^2+1)=0 |