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)
12/x-(18/x)-0.3 = 2 // - 2
12/x-(18/x)-2-0.3 = 0
12/x-18*x^-1-2-0.3 = 0
-6*x^-1 = 2.3 // : -6
x^-1 = -0.38333333
-1 < 0
1/(x^1) = -0.38333333 // * x^1
1 = -0.38333333*x^1 // : -0.38333333
-2.60869567 = x^1
x = -2.60869567
x = -2.60869567
| f(-7)=x-10 | | (2x-6)/(x)=(x-3)/(3) | | (7/2t)-2=(-4)-(7t) | | 8x+5y=186 | | 5x+18x+9=0 | | 4x-2z=44 | | 14+5=5x-6(-3x+15)+5 | | 4-y+x=0 | | 14+5=5x+-6(-3x+15)+5 | | 22-(x+9)=8x-5 | | 9=ab | | 19=5x-6(-3x+15)+5 | | (7x-2)(x-1)=0 | | x-3/5=1/x | | x^2-4x+4=x | | 4r+5=13 | | H=-3x^2+12x | | 1/2(0-8) | | 6-2x=6x-10x+1 | | 25/7-4 | | 4(a-1)-3(2-a)=2 | | 25/7-54 | | 2x+4(9+3x)=66 | | 6y-2=3x+10 | | 3g+6=24 | | y-16-3-y=0 | | -4x(-1)+2y=-30 | | 5x-55=-130 | | y+3z=6 | | 4x(-1)+8y=20 | | 9-n=-5n+7n | | -99+7y=-4y |