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)
(4/7)*m+3 = (4/5)*m+9/35 // - (4/5)*m+9/35
(4/7)*m-((4/5)*m)-(9/35)+3 = 0
(4/7)*m+(-4/5)*m-9/35+3 = 0
96/35-8/35*m = 0 // - 96/35
-8/35*m = -96/35 // : -8/35
m = -96/35/(-8/35)
m = 12
m = 12
| -7/10+1/2d=-1/2d+43/10 | | b+1/2=-10-3/4b | | 2/3m-1=5/6+1/2m | | 6d+5/8=-97/24+2/3d | | 10-5/6m=6m+265/6 | | -1/2m-1/9=-2m+49/45 | | 6w-10=-61/7-3/7w | | 1/7m+1/4=6m-163/4 | | 1-3d=2/3d+21/10 | | -1/2-1/2a=-7a+45 | | 4/7t+3=9/35+4t | | -3/5t+5=-59/5-2t | | -6d+4=5/7d-10/21 | | 6/7a-4=7a-241/28 | | -2/3x+1/2=-7/6-x | | 4+4/7t=-t+160/7 | | 6m-7/9=347/63-2/7m | | 3/7+4k=-k-26/21 | | 8-5/6w=-1/3w+14 | | -t+3=5/7t-51/7 | | -2/5t+2/3=778/15+6t | | -1/2-4/5k=k+49/10 | | 4/5b+1/2=-1/6b+1/2 | | 1/2d-5/8=-265/72-5d | | w+2/9=5/7w-184/63 | | 5b+10=37/4+2b | | -5/6+d=7d+31/6 | | 6k-1=4k-1/4 | | -9+7x=-6x-55/9 | | -2/9+4a=3a-2/9 | | -1/2-4x=2x-145/2 | | 5x-2y-5=0 |