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)
1/2-7*n = (6/7)*n-(199/42) // - (6/7)*n-(199/42)
1/2-7*n-((6/7)*n)+199/42 = 0
(-6/7)*n-7*n+1/2+199/42 = 0
110/21-55/7*n = 0 // - 110/21
-55/7*n = -110/21 // : -55/7
n = -110/21/(-55/7)
n = 2/3
n = 2/3
| 1/2+2/5w=2w+53/10 | | 5-b=-1/2b+41/8 | | 4t+4/9=53/18+t | | 8-t=4/5t+94/5 | | 3+5m=1/2m+3 | | 3/7+3/7k=7k-13/77 | | 6m-7=-245/66+5/6m | | a-9=2a-14 | | 1/3k-6=8/7-6/7k | | -d+8=34/5+5d | | 9+4a=2/5a+36/5 | | 2x+2/7=44/7-x | | 7w+3=14-4w | | 5/7k+2/9=k-22/63 | | 1/2b-5=11/2+2b | | 7b-3/8=b-99/8 | | -9+5w=3w-105/11 | | -7+1/2n=n-11 | | 6d+3/7=-4/7+4d | | x+4/5=6x+229/5 | | 10-5a=-a-2 | | -3/5w+5/6=-w-23/30 | | -1/6w+1/2=161/3-5w | | -3/7-3/5a=6/7a-24/5 | | 5/9+5/6m=1/3m+19/18 | | 4/7t-3/4=t-81/140 | | 3w+10=113/14+3/4w | | x+2=38+4x | | 3/7k+3/5=6/7k-39/35 | | -k+3/10=-11/5+2k | | -2/7k-6=-50/7+6/7k | | a+3/7=-5/6a-376/21 |