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)
-13/3 = 7*a+(1/2)*a-6 // - 7*a+(1/2)*a-6
6-(7*a)-((1/2)*a)-13/3 = 0
(-1/2)*a-7*a-13/3+6 = 0
5/3-15/2*a = 0 // - 5/3
-15/2*a = -5/3 // : -15/2
a = -5/3/(-15/2)
a = 2/9
a = 2/9
| -3/4-k+7k=13/4 | | 1/4b+2/5+1/2b=23/20 | | 8(3x-4)=4(6x+5) | | 4/9+5m-4/7m=121/63 | | 20/7=6/7t+2t+2 | | 3x/5+5x/3 | | 269/66=7d+1/2d+2/3 | | -1/5-6w-5/6w=971/270 | | 2x-2+2x=18 | | -4/5-n-3n=116/5 | | 5x=87+2x | | 2+2/7a+a=113/7 | | -1/3+5d+5d=-61/3 | | -326/7=-2/5a+5a-4/7 | | -49/45=-4a+2a+1/9 | | 37/10=-1/2m+5m+1 | | -31/72=-6m+7m-7/8 | | 2/3n+7-n=19/3 | | -1/2n+4-6n=-11/20 | | 29/8=2d+3/4d+5 | | 535/33=5/6n+6n+10 | | 6+k+5k=48/7 | | 5a-10+a=26 | | 3/5+3/7a+7a=73/35 | | 7/9+2/3d+d=187/9 | | 27=-2x+6x-1 | | 1/5w-4-w=-108/25 | | 5-4/7t-5/6t=-190/21 | | 2/7a+5/9-a=0 | | 4n-3+4/5n=129/5 | | 167/35=4/7b-4/5b+5 | | -41/10=3t-1/4t-3 |