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)
-2*n-(3/7) = -3/7 // + -3/7
-2*n-(3/7)-(-3/7) = 0
3/7-2*n-3/7 = 0
-2*n = 0 // : -2
n = 0
n = 0
| -2n-3/7=-23/21 | | -2n-3/4=5/6n-181/60 | | -2n-3/10=-23/10 | | -2n-3=-39/11 | | -2n-2/9=-11/9 | | -2n-1/2+6n=39/2 | | -2n+8=20/3 | | -2n+7=-11+4n | | -2n+6+5n=42 | | 76=14x+20 | | -2n+4=16/3 | | -2n+3/5=-37/5 | | -2n+2/9=-4/3 | | -2n+2/9+5n=-44/45 | | -2n+10=95/12+1/2n | | -2n+10=28/3 | | -2n+10=102/11 | | -2n+1/2=-7/2 | | -2m=-20 | | -2m=-14 | | -2m-9/10=-209/10 | | -2m-9=-19/2 | | -2m-8=-24 | | -2m-7/9=-43/9 | | -2m-7+1/3m=-16/3 | | -2m-5/6=-13/30 | | -2m-3/5=-19/15 | | -2m-2/5=-22/5 | | -2m-1/2=-19/22 | | -2m+9=8 | | -2m+9=17 | | -2m+9+2/5m=37/5 |