If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
5*k-7 = -47 // + 47
5*k-7+47 = 0
5*k+40 = 0 // - 40
5*k = -40 // : 5
k = -40/5
k = -8
k = -8
| -4+6w=26 | | 1+2w=25 | | 6n-5=-29 | | 4m+10=26 | | 6m-6=-6 | | 7+3k=31 | | 7-3n=28 | | 7k+10=73 | | 3k-2=34 | | -4-2m=-14 | | 6n+10=-14 | | 5w+1=26 | | -7w+1=-27 | | 5b+8=23 | | -4m+5=53 | | 2-4m=-34 | | 4-5k=19 | | -2t-2=-18 | | -2n+4=10 | | -5k+9=-11 | | 1+6k=-17 | | 4+4m=32 | | -4-3t=-22 | | 2t+9=21 | | -10-3d=-25 | | 2b+9=-13 | | -7t+8=92 | | 4-4d=28 | | 3m+2=38 | | 5a=2a-12 | | 7p+9q=15 | | 2a+7=-9 |