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)
-(4*a)-1/4 = (4/7)*a+235/84 // - (4/7)*a+235/84
-(4*a)-((4/7)*a)-1/4-(235/84) = 0
(-4/7)*a-4*a-1/4-235/84 = 0
-32/7*a-64/21 = 0 // + 64/21
-32/7*a = 64/21 // : -32/7
a = 64/21/(-32/7)
a = -2/3
a = -2/3
| 17x^2=34 | | 7m+9=-454/7+2/7m | | 5/7n-1/8=-33/56+1/4n | | 1/3x+8=6x+236/21 | | 4/5x-2/3=4/5x-2/3 | | 3/7a+1/2=-6/7a+1/2 | | 5+7w=5w+41/7 | | 2t+4=40+6t | | -8+2/7x=2x-68/7 | | 2+7a=5/7a-42 | | 6/7+7x=3/7x+5/2 | | 2/3b+4/9=484/9+6b | | 4d-10=-9-1/2d | | 3+t=6t+18 | | 7w+7/8=4/7w+3289/56 | | 5k+4=58/7+5/7k | | 1/3w-3/8=-145/216+w | | 5/7m+1=83/42-3/4m | | 4a-3/4=-7a+161/20 | | -2/3w+10=7w+56 | | -1/2k-9=-52/5+3k | | -1/3m-3/5=-59/15+3m | | -6m+1=-6/7m-13/5 | | 2t+4=12-6t | | 6d-3=-39/28-3/7d | | 4/7+3m=-3/5m+272/35 | | -3/7x-5=-85/7+x | | 3k-1/6=-2k+229/66 | | 3/4a+1/8=-49/24+4a | | 6+6m=5/6m+191/6 | | 5-7k=-4k+3 | | -1/4-7m=-5/7m+169/28 |