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)
6-6*k = 12 // - 12
6-6*k-12 = 0
-6*k-6 = 0 // + 6
-6*k = 6 // : -6
k = 6/(-6)
k = -1
k = -1
| 4+6w=-32 | | 6b-1=71 | | 2b+3=15 | | .3y+.9=.1-.1y | | -5d+8=-12 | | 6m+10=-20 | | 9+2n=33 | | y=-2x^2-16x-30 | | -10+5w=35 | | 30=-9b-13 | | 7-5x=57 | | 5w+10=35 | | -4-2a=-14 | | -5+3t=-23 | | 2(3+3x)-2=34 | | 5a+8=48 | | -6x-9=51 | | 6+3a=9 | | 6a+3=27 | | (x-a)(x-b)=c | | 15/12-11/6x=-11/2 | | 200+3x=7x | | 2+6n=56 | | 7a+10=87 | | -3w+5=-10 | | 8+3a=-25 | | -6t+6=78 | | 5d+6=11 | | 7(a-7)+24=4(a-4) | | (x-a)(x-b)+c=0 | | -3-5n=-8 | | -1-6n=41 |