If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9/k = 10 // - 10
9/k-10 = 0
9*k^-1 = 10 // : 9
k^-1 = 10/9
-1 < 0
1/(k^1) = 10/9 // * k^1
1 = 10/9*k^1 // : 10/9
9/10 = k^1
k = 9/10
k = 9/10
| 53k=3816 | | 2g+3g+-g+-g-3= | | X2.[2x/5-4]=0 | | b+2=-12 | | 4x^2-4-15=0 | | 7e-m-4w= | | 4(2+9k)+9= | | 4(2x-5)=3x+5 | | 7x-x+4x=20 | | 4(2x-5)=3x-5 | | y=9e^7x | | 0.1x+0.4=0.5 | | 5x+x+4x-4x=6 | | 2x^2+2x+xy+y= | | 4t+4t+5t+5= | | 31+6x=2x(-x-6) | | 3/7=n-7/2 | | -24=-4/9x | | 3x-10+2x-5=180 | | 49x^2+42x=17 | | 2x=5sin(2x) | | -15=-3/4w | | 12x+5=6(2x-8) | | -3.4t-3.1+-3.4+8.4+-4.7= | | (x^2)/(2)-5x=-8x | | 5(1+n)=2(7+n) | | 5x+22=-3+x | | 100(4x+380)+200(4x)+400(x)=86000 | | x^2+14x=26 | | M=20x+11 | | 25+x=4x-59 | | 2(8+-2t)+-10t= |