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)
338/35 = (5/7)*n+(4/5)*n-7 // - (5/7)*n+(4/5)*n-7
338/35-((5/7)*n)-((4/5)*n)+7 = 0
(-5/7)*n+(-4/5)*n+338/35+7 = 0
583/35-53/35*n = 0 // - 583/35
-53/35*n = -583/35 // : -53/35
n = -583/35/(-53/35)
n = 11
n = 11
| 9-7k+4k=39/4 | | 71=-4t-4t+7 | | 3+5b+2/3b=94/3 | | 1-4n+2n=-13 | | -8/9+1/3b+7b=-536/9 | | 59/40=2a+a+7/8 | | -5/6b-5/6+1/7b=55/21 | | 143/7=2m+5m-4/7 | | -2/3b-6/7-3/7b=-29/7 | | -97=-7n-3n-7 | | -1/2b+7-5/6b=181/27 | | 12/7=x-7x+6 | | 33=-x-2x+9 | | -206/7=6/7d+5d-6 | | w+8-3w=12 | | 1/2x-2/5+1/2x=3/5 | | 1/2x-4/5+4x=1/10 | | (2/5x3)-2 | | -8+6n-1/3n=-25 | | 5w+4+2/3w=-13/18 | | 8+k-2/5k=17/2 | | 8+d+3d=11 | | -1/9+1/2d+4d=181/72 | | -7x+9/10+x=-87/20 | | 4/5k+7+6k=7 | | 51/20=d+1/2d+3 | | x-9-1/2x=-5 | | 8=-5k+k+6 | | -9/10-2/7d+6d=337/70 | | 10-3/4w+1/3w=35/6 | | 27=x+6x+6 | | 373/240=5/6b-1/5b+1 |