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-6 = -15 // + 15
a-6+15 = 0
a+9 = 0 // - 9
a = -9
a = -9
| w-10=-7 | | m/-2=-1 | | 17=b+8 | | 7d=42 | | w+4=14 | | -5=b+1 | | 1+w=-5 | | 3+w=7 | | 5=t+3 | | m+7=14 | | 3+a=6 | | -6a=24 | | -3(-7x+2)-2x=-1 | | 8+m=2 | | 3b=-15 | | 12=k+7 | | w+6=14 | | 10=t+10 | | 2+d=2 | | -5=d+2 | | t+6=14 | | 2y=16+12z | | 2y=12z | | m+6=7 | | -4+m=-9 | | 5+4r-1=9r+8-6r | | -2=k-9 | | 5a=-20 | | -3+n=-1 | | -11=d-4 | | X/-3=15 | | -3x-4=2x-3 |