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+3 = -5 // + 5
k+3+5 = 0
k+8 = 0 // - 8
k = -8
k = -8
| 3+k=-8 | | 6+a=13 | | 2+m=8 | | -2=a+1 | | k/6=-5 | | 7+8b-12=3b-8+5b | | -9+d=-13 | | 7+w=-4 | | -10+b=-2 | | 2=d+8 | | k/3=-5 | | 5x=7y | | 13=t+1 | | -13=w-6 | | t-6=-2 | | m-3=-1 | | -7b=-21 | | 18=d+9 | | 9=k-3 | | 10+x=8 | | 20=t+8 | | 5=x+5 | | b/-3=-2 | | t+9=5 | | 7+b=2 | | -5a=-60 | | -9=w-4 | | -6+k=-7 | | 3=t-5 | | -5=t-6 | | a/2=-7 | | t+9=7 |