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 = 39 // - 39
4*b-39+7 = 0
4*b-32 = 0 // + 32
4*b = 32 // : 4
b = 32/4
b = 8
b = 8
| -7-6n=-31 | | -5+7x=9 | | 6w+8=20 | | 2+3n=38 | | -3x-12=2x-22 | | 2-4m=-38 | | -3b-10=-1 | | 7-5w=-23 | | 6d-9=-57 | | -5k-1=-41 | | 5t+4=-21 | | -4x-4=-32 | | -2x+10=-x+16 | | -4+7a=52 | | -1-3w=-16 | | 1+3t=-2 | | 9+7a=-54 | | 4x+19=6x+17 | | -5w+2=-23 | | 7b+5=33 | | -2n+6=-4 | | 7x-14=10x-20 | | -5x-5=-x-21 | | 3n-10=-22 | | 9+6x=45 | | 7+3b=16 | | -2x+19=5 | | -6a-1=29 | | 1-4t=1 | | 1-3t=28 | | -3n+5=-16 | | 8x+13=x+48 |