If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
d+4 = 15 // - 15
d-15+4 = 0
d-11 = 0 // + 11
d = 11
d = 11
| 12=t+7 | | 9+t=9 | | V=a+z*b*h/2 | | 11=b+8 | | 7n=-63 | | 7d=-7 | | 5+w=-3 | | -6+t=0 | | w+5=-1 | | 4=d+3 | | -9=d-6 | | -9+m=-6 | | -2+n=-7 | | -8=b-10 | | k-9=-5 | | n-6=-18 | | 3a=-21 | | w+9=18 | | t+3=-5 | | 5+t=-1 | | 2+k=0 | | -7+w=0 | | 2=m-4 | | m/5=7 | | 4=w+9 | | -3=t-3 | | 3t=-18 | | -7+k=-17 | | b-2=-14 | | 6=n+10 | | -5+a=-13 | | 17=k+6 |