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)
6/x = 4/14 // - 4/14
6/x-(4/14) = 0
6/x-2/7 = 0
6*x^-1 = 2/7 // : 6
x^-1 = 1/21
-1 < 0
1/(x^1) = 1/21 // * x^1
1 = 1/21*x^1 // : 1/21
21 = x^1
x = 21
x = 21
| 2sinx=3 | | f(x)=1-x-2 | | 6p+6(5+p)=90 | | y=5cos(5x) | | 3n(7n-20)=90 | | (2a^5b)^5/40b^4 | | 0.5+4=7 | | 6(4n+1)-4n=106 | | y=2-x+2 | | p/15t-700 | | y=2-x-2 | | -2(-7m+1)=-100 | | 3x-9y=-17 | | a^2-2a-2=0 | | 6.7x-1=5.7x | | 289=-16t^2+vot | | 5x^3-20x^2+x=0 | | -7[-3+-4]= | | 1.25x^2-2x=1 | | log(x)=7.5 | | 5300=.5x+300 | | -4(8m+2)=-168 | | 5000=.5x+300 | | 10300=.5x+300 | | 4x+5=-7-2x | | (X-3)(x+6)=x^2+6 | | .5x+300=5300 | | (5x+54)+(3x+12)=90 | | (2x+9)=(2x-9) | | -3-x-8+6x=7 | | 5t(t-3)=25 | | 149-4x= |