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)
1/x = 0.13 // - 0.13
1/x-0.13 = 0
1*x^-1 = 0.13 // : 1
x^-1 = 0.13
-1 < 0
1/(x^1) = 0.13 // * x^1
1 = 0.13*x^1 // : 0.13
7.69230769 = x^1
x = 7.69230769
x = 7.69230769
| 4x+5-x=2(q-3) | | -12=n+6 | | 7x=6-(-15) | | -(2x-3)+12=34 | | 3y=5y+9+17 | | -9d=-10d+7 | | -7(5j+5)= | | 14g^2-10g-130=0 | | -5(x+2)-11=13+1 | | 3-.5y=1.5y-5 | | -4+3v=-10 | | 3.95+.08=0+.1 | | 9x-12=x+3 | | 6(1-7b)+7(b-3)=55 | | D/4=88 | | 7=-7+2u | | -y-6=y-16 | | 2k+5k=3(1-2k) | | 8/11(n~10)=64 | | 1x+7y=24 | | 15-1/6n=1/6n--1 | | .66y=-8 | | 36-3x=3(8x+3) | | 5x+4y=26.25 | | 9x-2=y-16 | | .5x-6=10 | | 11x^3/8x= | | (2x+5)+(6x-13)=24 | | 4X/7=21 | | (x^2)(x)= | | 4X/21=21 | | 4=-6.1+d |