If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
2*x+9 = -x-6 // + -x-6
2*x+x+6+9 = 0
3*x+15 = 0 // - 15
3*x = -15 // : 3
x = -15/3
x = -5
x = -5
| 3m-4=-2m+41 | | 10+6x=-x-67 | | 6x+2=34+2x | | 4a-4=-92-7a | | 10+3b=5b-12 | | 2n+6=30+5n | | 8+4b=-5b+89 | | 3m-3=7m-39 | | 8+n=-6n+64 | | d+1=-11-5d | | 7m+5=5m+29 | | -6x+2=4x-38 | | 5t+10=14+t | | -7b+3=b-13 | | 4x^2-8x+c=0 | | 2+6k=-3k+11 | | 7a+5=6a+10 | | 3d-6=-13+4d | | -6t-5=-t+35 | | 3a-9=39-a | | -2b+6=3b+1 | | 5x-3=7x-3 | | k+7.2=3.4 | | 5+3n=-5n+29 | | 7+3x=-7x+127 | | 5+t=6t+55 | | -3n+7=7n-43 | | 5a-10=-5a+90 | | 5d-7=4+6d | | -7b-7=-43-3b | | 5+d=3d+9 | | 6x+9=8+5x |