If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
k+9 = 15 // - 15
k-15+9 = 0
k-6 = 0 // + 6
k = 6
k = 6
| 2=n-6 | | 2=k-8 | | a^2+12a+20= | | m-3=-10 | | n/-5=-4 | | -6=t-2 | | k+9=-1 | | -2m=-18 | | -4+t=2 | | -9+b=-4 | | -1+t=7 | | -8=w+4 | | d/-2=-5 | | 6a=66 | | -3w=9 | | 14=w+5 | | d+3=4 | | 3x-7=17+x | | k+1=5 | | 16=n+10 | | d/5=-2 | | -1+x=7 | | a/5=-2 | | 8+t=17 | | w/3=-7 | | 6b=-42 | | 8n-11=6x+3 | | 2=a-1 | | b-1=10 | | t-5=-7 | | -5w=-35 | | a+1=-3 |