If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
6*(2*a+2) = 12 // - 12
6*(2*a+2)-12 = 0
6*(2*a+2)-12 = 0
12*a = 0
12*a = 0
12*a = 0 // : 12
a = 0
a = 0
| 3(7d+8)=213 | | 4(-9+a)=-52 | | 7(-3-7m)=-70 | | 5(3t-7)=100 | | 5(-2+4t)=50 | | 3(6-2b)=6 | | 7(10+3w)=112 | | 2(9-6w)=-66 | | 2(-5+7t)=102 | | 5(-2-5x)=-285 | | 3(2d+7)=-51 | | 5(8+a)=85 | | 3(5+5k)=135 | | 3(-3m+1)=48 | | 2(3x-7)=-20 | | 7(-1a+9)=28 | | 2(4+6w)=-64 | | 4(-2+7t)=132 | | 7(-9-a)=0 | | 4(5x-2)=112 | | 3(-10-3w)=-21 | | 3(-3n-5)=-87 | | 2(8-7n)=-26 | | 4(3x+8)=-76 | | 4(2d-4)=0 | | 3(4k-9)=-135 | | 4(8-x)=-4 | | 7(7-5w)=-336 | | 2(6-4w)=-36 | | 4(-5b+3)=-28 | | 5(3+w)=-40 | | 3(8+2t)=84 |