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/y-(1/x) = 1/42 // - 1/42
1/y-(1/x)-(1/42) = 0
1/y-x^-1-1/42 = 0
-1*x^-1 = -(y^-1-1/42) // : -1
x^-1 = y^-1-1/42
-1 < 0
1/(x^1) = y^-1-1/42 // * x^1
1 = x^1*(y^-1-1/42) // : y^-1-1/42
1/(y^-1-1/42) = x^1
x = 1/(y^-1-1/42)
x = 1/(y^-1-1/42)
| x^10+31x^5-32=0 | | 64t^2+28t+1156=0 | | 2x+29=9 | | 1x+12=-1x+4 | | x+(5x-3)=87 | | -2(8x-8)=-96 | | 5(-7k+6)=170 | | 12t+-8=52 | | 0.25w-6=0.83w+8 | | (x+5)+(x+5)=(4x-2) | | x+5(x-3)=87 | | -0.6+7+0.4b=19 | | -4x+2x-x=15 | | X^2+2x+1=4(x+4) | | 24-3x=7x+4 | | sinx=0.27 | | 2x-x+7=5x+10-3x | | 1.4x-1.33-1=8 | | 4/3*3.14*81*1.7321 | | 339=7(1+8p) | | 5x+6x-7=15 | | 114=-6(n-8)-5n | | 8x^2-23x+6=0 | | (3x+4)=(5x) | | 3x+9x-12=0 | | -332=4+8(-7+5a) | | Ln(x+1)-ln(x)=1 | | 0x-7=1x-7 | | z^3=216 | | 8x+10=24+6 | | 7m-22=41 | | 2n+2=3n-5 |