If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
3-7*n-(3*n) = -67 // + 67
3-7*n-(3*n)+67 = 0
3-7*n-3*n+67 = 0
70-10*n = 0 // - 70
-10*n = -70 // : -10
n = -70/(-10)
n = 7
n = 7
| 81=4a+2a+9 | | -7b+3-4b=-107 | | 8+7d-5d=16 | | 4m-9+2m=15 | | 3+6t+2t=27 | | 10-3k+6k=13 | | 8q+2.8=0.4 | | a+7-7a=1 | | 5w+4-3w=8 | | 34=-b+5b-2 | | 7t-1+t=39 | | 8-2t+t=10 | | b+1-6b=21 | | 7=3d-5d+9 | | 4k^2+4k=0 | | 1+7a+4a=-76 | | b+6+7b=54 | | -2b+8-2b=-32 | | 2-t-7t=18 | | 3x+1+2x=46 | | -2b-1-4b=-13 | | -9-6m-5m=2 | | -7k+1-k=-47 | | 6n+2-5n=9 | | -5m+5+7m=17 | | 2n+6+6n=6 | | 7w+2+w=66 | | 8-6k+k=28 | | 3=3m+7m+3 | | -4m+1-2m=-17 | | 7=-2n-6n+7 | | -7m+10+5m=32 |