If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
31/12 = 5*x-((1/2)*x)+1/3 // - 5*x-((1/2)*x)+1/3
(1/2)*x-(5*x)+31/12-(1/3) = 0
(1/2)*x-5*x+31/12-1/3 = 0
9/4-9/2*x = 0 // - 9/4
-9/2*x = -9/4 // : -9/2
x = -9/4/(-9/2)
x = 1/2
x = 1/2
| -37/6=4/7d+1/2d-7 | | -2/3k-4-k=-19 | | -7m+5+3/5m=409/5 | | 7m+1-3/7m=375/7 | | 3/5n+5+1/4n=27/2 | | 3/10+2k+7k=-1077/10 | | -7n+8/9-2/3n=-61/9 | | 3x-7/9+3x=587/9 | | -3/4-7a-5/7a=-663/308 | | 3t+8+3t=12 | | 7w+1/2+7w=-51/10 | | 5/7m+1+2m=-125/84 | | 218/63=-1/2a+5/7a+8/9 | | -6t+5/6-4t=-55/6 | | 7+5w-3/5w=-15 | | 5/6k+3+1/2k=11 | | 7t-1/5+4t=4/5 | | -6+a+2/3a=-58/3 | | 6+2k+2k=24/5 | | -5/9-m+2/3m=-20/9 | | -166/9=n+n-4/9 | | 5w+6/7+w=46/21 | | -1/2t-1+7t=38 | | 2/3k+9-2/3k=9 | | -1/2+1/2t+4t=-2 | | -1/18=7n-n-5/9 | | -k-2/3-k=-2/21 | | -2/3+4t+3/7t=358/21 | | 4=t-5t+4 | | 2m+5=m/5-4 | | -1/2w+4/5-2/5w=-1/10 | | -2/7w+9/10+6w=1663/70 |