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-(37.61/x) = 0.42 // - 0.42
1-(37.61/x)-0.42 = 0
1-37.61*x^-1-0.42 = 0
-37.61*x^-1 = -0.58 // : -37.61
x^-1 = 0.01542143
-1 < 0
1/(x^1) = 0.01542143 // * x^1
1 = 0.01542143*x^1 // : 0.01542143
64.84482957 = x^1
x = 64.84482957
x = 64.84482957
| g+g=4g-6 | | 1-(31.80/x)=0.48 | | 5x+71=3x+87 | | 1-(39.67/x)=0.55 | | (4x-1)(4x+1)=0 | | 90*x-4.9*x^2=-150 | | 2x+97=5x+40 | | 6-9x=129-30x | | 6r+6-4r=2(r+3) | | 1-(12.41/x)=0.25 | | 2x+53=5x+80 | | 1-(22.46/x)=0.25 | | 1-(26.49/x)=0.25 | | (3x-1)(x-6)=0 | | 1-(33.80/x)=0.35 | | 4(3x-1)=20 | | 1-(63.00/x)=0.30 | | 1-(63.0/x)0.30 | | 125-5x=11-10x | | 125-6x=11-10x | | x^2+3x+15=0 | | 1-(181.30/x)=0.30 | | 5n=2/3/4 | | 1-(35.62/x)=0.25 | | 450=x+-0.2x | | 1-(77.49/x)=0.35 | | 300=x-0.2x | | 1-(64.06/x)=0.35 | | P=-17+5t | | 1-(45.08/x)=0.30 | | 1300=x-0.2x | | 1300=x+-0.2x |