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)
2*k-8 = -4 // + 4
2*k-8+4 = 0
2*k-4 = 0 // + 4
2*k = 4 // : 2
k = 4/2
k = 2
k = 2
| -5/6x-3/7=-53/42 | | 5+6b=-25 | | 2/5a+7/9=53/45 | | 1/2+1/4m=7/24 | | 5-2/3n=22/5 | | 9/10-n=123/70 | | 3/5-6/7k=471/385 | | -8+1/2b=-14 | | 6d+3/7=-135/28 | | -1/2k-1/2=-5/7 | | 2/5w+7=387/55 | | -5x+1/5=-47/15 | | 4/5a+7=34/5 | | 4b+1/4=129/4 | | X-2*x+10*2=12 | | -7/8+5t=-7/8 | | -3/5w-3/10=-39/10 | | -1/6m+2/3=15/22 | | w-9/10=-89/10 | | -3/7k+2/3=13/33 | | 4/7k+3/8=-17/168 | | 5m+7/9=502/9 | | -2/5-4/5m=-2/5 | | 4k-1/2=-7/2 | | 7+w=-3 | | 8+6w=80/7 | | 4t-8=-7 | | 1/5-3w=17/10 | | k+8=20 | | 3/8+7m=-165/8 | | 4n-2=-14 | | 2-y=23 |