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)
18 = 2*a+3*a-2 // - 2*a+3*a-2
2-(2*a)-(3*a)+18 = 0
2-2*a-3*a+18 = 0
20-5*a = 0 // - 20
-5*a = -20 // : -5
a = -20/(-5)
a = 4
a = 4
| 5=-7d+6d+7 | | 112=5m+7m+4 | | 0=4m+5m-9 | | 27=5d-d+3 | | 6k+9+k=79 | | 3+2b+6b=43 | | -6-2k-5k=-90 | | 104=5n+4n-4 | | -5+4n-5n=3 | | 3+2k+k=36 | | 2n+6-5n=-30 | | 3+b+b=9 | | a+9+a=-13 | | 7=-5k-2k+7 | | 4t+8-7t=23 | | 89=4n+5n-1 | | -2=-3w+w+10 | | -7=w+2w+8 | | -59=-6w-4w+1 | | 45=5m+2m+10 | | 1+5n-2n=1 | | -3b-3+4b=-3 | | 49=5b+b+7 | | 3=-4x+x+3 | | 66=2k+7k-6 | | -7=2b+7b-7 | | -3-6b+b=32 | | 4+k+3k=24 | | 41=3m+7m-9 | | 6d-8+4d=-88 | | 5w-8+3w=-24 | | 1+6x+x=8 |