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)
(2/7)*a+(1/3)*a+7 = 722/105 // - 722/105
(2/7)*a+(1/3)*a-(722/105)+7 = 0
(2/7)*a+(1/3)*a-722/105+7 = 0
13/21*a+13/105 = 0 // - 13/105
13/21*a = -13/105 // : 13/21
a = -13/105/13/21
a = -1/5
a = -1/5
| 2x-1+2/3x=-23/15 | | 17=3d-7d+5 | | 20=7w+4w+9 | | -1/5n-3/7-3n=-139/63 | | 1/3+1/2=5 | | 5x+5/12-4x-1/3=11/12 | | 15/28=k+1/4k-5/7 | | 10+6/7x+4/5x=2566/245 | | -3/7+2k+5k=-52/7 | | 1/5+1/3a-7a=-1097/15 | | 1/3+4t+6t=23/9 | | 1/2+m-3m=-43/2 | | -6.8x=5.304 | | -5x+2+2/3x=-7/3 | | -59/12=6a+1/5a+1/4 | | -4/5w-5+3w=-64/15 | | -5/6b-5+1/3b=-27/5 | | 5/6t+3/5-3/4t=223/330 | | 36/35=-1/2m+2/5m+3/7 | | -9x+25+11x+25=4 | | -6/7x-6+x=-32/7 | | 1/7-1/2x-2x=-313/14 | | n-1/6+5n=16/3 | | 5-2x/2x-5 | | t+8+4/5t=65/7 | | 90=7n+3/7n+6/7 | | 1/5+k+4/7k=-103/35 | | 169/45=3n+2/5n+3 | | 1/2(b-4)=2 | | 2x-1/5-7x=-53/15 | | -171/140=-4/7m+m-9/10 | | 53=4k+2k-1 |