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)
4*b+7 = 8 // - 8
4*b-8+7 = 0
4*b-1 = 0 // + 1
4*b = 1 // : 4
b = 1/4
b = 1/4
| 9/10+6n=423/70 | | 2/7w+6=452/77 | | 4/7k+3=41/7 | | -3/4t+6/7=-15/7 | | 1/6a+5/9=-23/18 | | 2/5+b=42/5 | | -5x-1=-49/9 | | 2/3b+1/5=21/5 | | 6/7t+8=59/7 | | -7d-6/7=31/21 | | 2m-3=-4 | | 2/3-6t=31/6 | | -2/5w-2/9=206/45 | | 3x-4+2x=41 | | -1/2x-1=-7/8 | | 1-2x=7/3 | | 1/2-3/4w=-1/10 | | -8+3/4w=-59/4 | | a+1/7=74/77 | | -6/7b-10=-16 | | 1+1/4w=6/5 | | 1/2n-2/9=-49/72 | | -5/8+1/3k=19/8 | | 5/6t+7=67/6 | | 8+5w=19/3 | | 2/3b+7=239/33 | | 6d+7=37 | | 7m+1/6=253/6 | | 1/3t+8=5 | | -7t-8=-53/11 | | 1/3w-2=-8/3 | | -3/4m-7=-95/14 |