If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
6-((4/5)*a) = (1/2)*a-(31/10) // - (1/2)*a-(31/10)
31/10-((4/5)*a)-((1/2)*a)+6 = 0
(-4/5)*a+(-1/2)*a+31/10+6 = 0
91/10-13/10*a = 0 // - 91/10
-13/10*a = -91/10 // : -13/10
a = -91/10/(-13/10)
a = 7
a = 7
| 1+7d=-2/3d-11/12 | | -7a-3=3a-73 | | 1/2t-1/2=3t-13/6 | | x-3=-5/2+1/2x | | 4x-12x^2+6=0 | | 2k+1=227/7-6/7k | | d-1/6=29/6+1/2d | | 3+5m=7m-7 | | 7-2/5a=7a+331/5 | | -5/7m+4/9=481/1386-5/6m | | 5b+2/3=11/3-b | | -6a+4=8/5+6a | | 3a-3/8=a-17/24 | | 10+3w=5/7w+318/35 | | 5w-8/9=-839/630+4/7w | | 3n-2/7=9/7+4/5n | | 3m+5/9=5m-71/99 | | 4n+9=-1/4n+121/4 | | 3/4-1/2d=3/7d+59/70 | | -8-n=-1/2n-33/4 | | -2/3-5n=n-28/15 | | -2/7b+4/7=7b-353/7 | | -7w+6=-9/5+4/5w | | -m+1=-5m+3 | | -1/3w+1=109/75+4/5w | | -7k+3/8=-2k+307/72 | | -5/7+1/2b=2b+121/7 | | a-1=7+3a | | 1/2m+1=6/7+m | | 3m-3/7=-3/5m-33/35 | | 2/7n+5/8=317/56+7n | | 6a+1/2=-1/6a+109/33 |