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)
b-6 = -3*b-42 // + -3*b-42
b-(-3*b)-6+42 = 0
b+3*b-6+42 = 0
4*b+36 = 0 // - 36
4*b = -36 // : 4
b = -36/4
b = -9
b = -9
| 6w-4=5w-3 | | -2w-1=-17-4w | | -3m-6=-m-8 | | -5t+5=2t+5 | | 5t+5=2t+14 | | x+2/3=x+1/2 | | 5t-2=6-3t | | 4m-5=-4m+67 | | 6d-6=10+4d | | 7k-4=5k-4 | | 5b+5=3b+27 | | -7t-10=-38+7t | | -6x+12y=-3 | | 5w+2=-4w-25 | | 5d+9=45-7d | | -3a+10=-18+a | | 1+5m=-5m+91 | | 5t+2=-34+2t | | 9-6m=2m-79 | | -5-5t=t-53 | | 18j-42=15-18 | | 9+3a=5a+15 | | -7x-2=3x-122 | | 2m+8=4m+0 | | 4x+3x+2=9x-8 | | 6m+7=-5m-70 | | 5-3b=-5b+3 | | -2+3w=-3w-14 | | 3+3m=-5m+43 | | -3m-5=-32-6m | | 2t-9=-18+t | | 6n+7=3n-17 |