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)
7/70 = 1/x // - 1/x
7/70-(1/x) = 0
7/70-x^-1 = 0
-1*x^-1 = -1/10 // : -1
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
| 4/20=x/v | | 4/20=x/x | | 8x^2+x-16=0 | | 30/66=z/x | | 100-6x=140-10x | | 10/20=x/4 | | 8x+10=-4x-20 | | 2/4=x/20 | | x/7=x-54 | | 7x+3-1=142 | | 2x+12=-7x-18 | | x^2y^2=12 | | 2w+10=42 | | 8/5=(-15-7z)/30 | | 6-h/3=17 | | -5x-27=5x-7 | | Vt=23(170)+300 | | 1.75-(0.625c-2.25)=0.875 | | .07x+x=53.40 | | 5y+12=212 | | [2x+4]+3=5 | | 40+2f=8 | | 4x+5=2x-21 | | 5(3x+2)-6= | | (6d-2)-(3d-3)=0 | | F(x)=x^2+12r+30 | | -1.7y-4=-4.51 | | X=73-y^2 | | -6.1-5x=11.9 | | 0.875+0.75b=-3 | | 22-5*2+3= | | 13-4*9/3 |