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)
5*a-(7*a)+8 = 100/11 // - 100/11
5*a-(7*a)-(100/11)+8 = 0
5*a-7*a-100/11+8 = 0
-2*a-12/11 = 0 // + 12/11
-2*a = 12/11 // : -2
a = 12/11/(-2)
a = -6/11
a = -6/11
| -26/5=3k+4/5k-9 | | 7+4/5m+1/2m=153/20 | | -40=2(4-3s) | | 3n+1/3+4n=53/12 | | -52/5=-3t+t-10 | | x+7/9-3/5x=191/315 | | k-3/5+1/3k=-29/15 | | 2b+5+2b=29 | | 9/10+b+2b=-81/10 | | 3(9-2x-9)+4(7x+6)=26 | | 5/7=-a+6/7a+6/7 | | 3/8+4a-1/2a=-277/8 | | 7+2/7a+1/3a=722/105 | | 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 |