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)
0.7 = 15.8/x // - 15.8/x
0.7-(15.8/x) = 0
0.7-15.8*x^-1 = 0
-15.8*x^-1 = -0.7 // : -15.8
x^-1 = 0.0443038
-1 < 0
1/(x^1) = 0.0443038 // * x^1
1 = 0.0443038*x^1 // : 0.0443038
22.57142728 = x^1
x = 22.57142728
x = 22.57142728
| x=20-5/3 | | x-5/7+x+8/5=8/7 | | x^2-14x-7= | | 6+x/2 | | 50=24.95+5.95x | | 1.18=34x+21 | | 1.18=34+21x | | x^2+23x+132= | | 6-2(2x-7)=9x-6 | | 11=1.5x+6.5 | | 6(t-5)+6t=6(2t+2)-8 | | 14y^3+16y^2-16y=0 | | r^2+49-49=0 | | R^2+49=0 | | 128*59/64*3/4=x | | 36=x+2x+3x | | x-1000=0.8x | | x=128*59/64*3/4 | | X^3-138=0 | | 5p^2=8p | | -11x-110=286 | | .5x^2+2x+3=3 | | d-17=14 | | 1k+1k+1k=1k+18 | | 9+a/4=-5 | | -4.9w=-29.4 | | -4.9w=-29 | | (3/2)^-3 | | -11x+103=29 | | .25g(5+3)-4g+13=0 | | 14T+32-5T-7=34 | | 19.9+4.1n=4.32 |