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)
k-(3/10) = 29/70 // - 29/70
k-(3/10)-(29/70) = 0
k-3/10-29/70 = 0
k-5/7 = 0 // + 5/7
k = 5/7
k = 5/7
| 2+t=23/10 | | b-1=5 | | k-2=-5/3 | | d+7=67/10 | | w+1=13 | | k+8=98/11 | | -25/63=a-2/7 | | m+5=27/5 | | 1/5=m+1 | | t-2/9=-47/90 | | 0.9x=-144 | | 1/7+b=10/21 | | t+8=14 | | t-10=-19/2 | | w+1/2=25/2 | | 10=n-1 | | m-4=-21/5 | | n/-7=-5/6 | | 71/12=x+5 | | m+3/5=-27/5 | | 1/8+x=97/8 | | a-2/5=28/5 | | b+5/7=47/7 | | b-9/10=-59/10 | | -9=a+1 | | n+5/9=136/99 | | m/-5=-5 | | n+1/9=109/9 | | t+9=83/10 | | 15/2=t+8 | | d-3/4=-33/20 | | -45/4=b+3/4 |