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-x)/x = 8/1 // - 8/1
(3.5-x)/x-(8/1) = 0
(3.5-x)/x-8 = 0
(3.5-x)/x+(-8*x)/x = 0
3.5-x-8*x = 0
3.5-9*x = 0
(3.5-9*x)/x = 0
(3.5-9*x)/x = 0 // * x
3.5-9*x = 0
3.5-9*x = 0 // - 3.5
-9*x = -3.5 // : -9
x = -3.5/(-9)
x = 0.38888889
x = 0.38888889
| 0.06x+0.16(700-x)=52.1 | | 91=6a+4(2a+4)+a | | 4x^2+14-168=0 | | 4u+10=-7(u-3) | | P/10=5 | | 0.07x+0.5(2x)=481.5 | | 3/4x21 | | 48h-6=426 | | 16y=15(y+5) | | -3m+49=7+4m | | -9s=72 | | 5=3logx | | 3n-9n-30=27-3 | | 9x-14y=-3 | | -3=-6n+1+2(n+1) | | 10.81+10+0.37x=25 | | 4x^1/3-x^4/3 | | 2x-y+2z=1 | | V=1/3Bh;B=15,h=10 | | y^3+7y=0 | | y-5=4/3(x-17) | | 3x+12=-2x-10 | | 8(x-2)+8=2x+6(-1+x) | | F(X)=x^2+14x+c | | Sqrt(2x)-x+4=0 | | 3x+12=-2x+10 | | -3k-4k+35=-21 | | 3p+4q=-1 | | G(x)=3x^2+2x+10 | | F(x)=-13 | | Y-4=1x+1 | | 5.69+2x=65.07 |