If it's not what You are looking for type in the equation solver your own equation and let us solve it.
m in (-oo:+oo)
6-(7*m) = -57 // + 57
6-(7*m)+57 = 0
6-7*m+57 = 0
63-7*m = 0 // - 63
-7*m = -63 // : -7
m = -63/(-7)
m = 9
m = 9
| -1-3b=-31 | | -3x-5=-8 | | -6n+2=-58 | | 7t+6=-78 | | 7d+2=-12 | | -10+4w=18 | | 4n-10=-6 | | 5b+2=47 | | -2d+2=22 | | 3d+5=38 | | 5m-6=-56 | | 3(t-2)+5t=4(2t+4)-13 | | 2+4x=-22 | | -1-2n=-15 | | 2b+6=22 | | -7m-4=-46 | | -5-2k=11 | | -4k+8=-4 | | -2a-1=17 | | -2d+1=-11 | | 5-4t=-43 | | -6a-9=39 | | -4n+8=-36 | | -4t+2=-10 | | 3+2a=7 | | -2+3m=-2 | | 5t+5=-50 | | 4-4b=-16 | | 2d-2=-22 | | 4m-2=18 | | 5/17x=35 | | 4m+9=5 |