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)
2/x = 12 // - 12
2/x-12 = 0
2*x^-1 = 12 // : 2
x^-1 = 6
-1 < 0
1/(x^1) = 6 // * x^1
1 = 6*x^1 // : 6
1/6 = x^1
x = 1/6
x = 1/6
| 21=7X-4X-9 | | 15=12v-7v | | 3x-(9x+4)=4x-44 | | 6+5x-3+(-x)= | | 3+4X-6X=3 | | 3x(4+5)=35 | | 9z=-90 | | -13n=-585 | | -3X+5+4X=16 | | (2x+95)+(6x+13)=180 | | 4b-b-8b=12 | | -3(9-7x)=120 | | -2(-1x+8)=-14 | | 2x+5=71 | | 3X-3-7X=13 | | 5x+525=y | | 7(-4+2x)=-8 | | 4(8+5x)=152 | | 69=4x+21 | | 8x^2+3x-9=0 | | 375=60-55 | | d/4/2=8 | | -4(-4+2x)=-8 | | 5X-7+3X=-7 | | 6(-1x+7)=-6 | | 55+h=375 | | 11=-6X+3X-10 | | h-55=375 | | 3(x-4)=-4x-44 | | 55h=375 | | C=30(60)+18 | | -3(-1+4x)=99 |