If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
a-4 = -4 // + 4
a-4+4 = 0
a = 0
a = 0
| w+5=10 | | 1=k+7 | | 15=k+9 | | 10+d=21 | | 2x-475+7654+57=10046 | | 2x+30=10046 | | d-9=-6 | | 9+w=19 | | 8965-69=8x | | 13=k+2 | | -7+m=2 | | 5+n=-6 | | -6=d-6 | | 7=t+1 | | 3d=-18 | | 2w=-20 | | k/7=-3 | | -7+n=4 | | -11=k-3 | | 5=m+9 | | 3=m+1 | | w/3=-3 | | d/-7=5 | | -2=w-6 | | -10+t=-2 | | 6+d=4 | | -1=d-8 | | w-4=-4 | | a/-7=-3 | | m+7=-4 | | 5+k=12 | | t/4=-2 |