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)
13 = k+5 // - k+5
13-k-5 = 0
8-k = 0 // - 8
-k = -8 // * -1
k = 8
k = 8
| p/4+5=p-4 | | a+10=8 | | -3+n=-3 | | 4+t=14 | | x/15=41/2 | | 0=n-8 | | 10=a-1 | | 4=m+9 | | 8+n=15 | | t/-2=4 | | m/5=-5 | | 2k/5-10=-2k/5+6 | | 4p-2(-7-4p)=7(7p+2) | | 2/5x-4/3=3x+1/2 | | 2h*2-5h+3=0 | | -2=d-9 | | b+1=-4 | | w-9=-7 | | 4-5(8n+3)=-7(6n+1) | | 2(3p+2q)+5(3p+q)= | | 10(7y-2-3)=4(2+6y-4) | | 5x+4=15y+4 | | k/2=6 | | t+6=18 | | -9=a-1 | | 4=k+6 | | -4=d-10 | | 2x+1=2y+1 | | 2x+5/8=3x-5/8 | | 7+3(2+w)=5(w-3) | | 15=t+10 | | 7d=-49 |