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)
4*a+2*a+6 = 18 // - 18
4*a+2*a-18+6 = 0
6*a-12 = 0 // + 12
6*a = 12 // : 6
a = 12/6
a = 2
a = 2
| -6t+4+2t=-16 | | -4t+1+6t=15 | | -5b+3-2b=17 | | 6b+2-5b=12 | | -6+7a-6a=-6 | | 5k-1+7k=-85 | | 6-3k-k=-22 | | -6=-7t-4t-6 | | -4w-9-5w=-108 | | -5t+8+2t=8 | | 4n+10-n=-11 | | -4+2w+6w=12 | | -2=-7m+6m+6 | | -7-3t-6t=11 | | -15=4w-5w-4 | | 7b-4+6b=61 | | 19=-7x+6x+8 | | 5-5t+6t=11 | | 2-4b+3b=-3 | | -37=7d-2d+8 | | -43=-7x-3x+7 | | 1-n+5n=9 | | 24=-3d+5d+2 | | -w-7+3w=11 | | 17+8x+13-3x=5x+15-2x+17 | | -4+5w+4w=86 | | -1+5t+7t=59 | | 2t+10+6t=-38 | | -17=3a-a-9 | | 7=-2d+d+10 | | -2-n+5n=-42 | | -21=4b+2b+9 |