If it's not what You are looking for type in the equation solver your own equation and let us solve it.
b in (-oo:+oo)
(2/5)*b+(4/5)*b+10 = 122/5 // - 122/5
(2/5)*b+(4/5)*b-(122/5)+10 = 0
(2/5)*b+(4/5)*b-122/5+10 = 0
6/5*b-72/5 = 0 // + 72/5
6/5*b = 72/5 // : 6/5
b = 72/5/6/5
b = 12
b = 12
| 1/5d+6/7+d=24/175 | | 2/7+a+7a=-558/7 | | -11/5=m+1/2m+4/5 | | 2/5-3/4a-a=13/120 | | 9-5/7k-1/2k=1209/140 | | 5/7k-4+2/3k=-533/126 | | 1+5a-1/2a=-7/2 | | 10+2/3t+t=125/12 | | 1/2+2x+1/5x=1/2 | | -6/7+3n-2n=1/56 | | 2w+7/8-5w=1/8 | | -1+m+4/5m=76/5 | | -7+3n+2/3n=-131/3 | | 545/48=4w-1/6w+8 | | 75=4a+7a+9 | | w+1/3+5/7w=-5/21 | | 1/2a+5+6a=63/10 | | 6-2d+3d=63/11 | | 9-3w+7w=1 | | 4x^2=5x+9 | | -16/7=3n+2/7n+1 | | 5a+3/4+6a=487/4 | | -614/231=5/6a+4a+6/7 | | 1/2+a+1/2a=1/5 | | 1-t+3t=-1 | | -1=3b+4b+3 | | 27=-4w+w+9 | | 3/5=4/7x-4/7x+3/5 | | -23/12=3n-7n+3/4 | | -7b+4/7-4b=-920/7 | | 91/2=-5k+1/2k+5 | | 2/3w+8-3w=202/27 |