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)
1/13 = 6/x // - 6/x
1/13-(6/x) = 0
1/13-6*x^-1 = 0
-6*x^-1 = -1/13 // : -6
x^-1 = 1/78
-1 < 0
1/(x^1) = 1/78 // * x^1
1 = 1/78*x^1 // : 1/78
78 = x^1
x = 78
x = 78
| -160=5a+6(7a-2) | | 9u^2-4x=0 | | 55=9r-8 | | -7(-5+7b)-5b=-289 | | -0.5+0.5b=-3 | | (-4+4i)-(2-6i)= | | 82=-2(-6-5r) | | 3x-7+1x=5 | | 1=r/20 | | (-7i)-(8+2i)+(8i)= | | 82=2(-6-5r) | | 3/4n-1=5 | | lnx=0.843 | | 9x+0.8=45.8 | | 4x+3(x+7)=1.4x(x+7) | | -1.8q-4(-3-4q)=9+10.2q | | -7(2+3n)=-98 | | 1x+5x-5=1 | | (2i)-(4i)= | | 144=3(6-6n) | | (6i)+(2i)= | | 8+2(2x+1)= | | -5+(-1+4i)= | | 9(u-3)=5u+9 | | -8(7-3k)=88 | | (-7i)+(4i)= | | -179=-4-7(1-3a) | | 9a+3=66 | | (6+3i)+5i= | | 4(b-1)+10= | | 5x(4y+2)-12xy=4 | | 2m/5 |