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)
-2*a-9 = -9 // + 9
9-2*a-9 = 0
-2*a = 0 // : -2
a = 0
a = 0
| -8=2(5x+1) | | 92-4x=41x+22 | | 6x+6=x+1 | | 3-2w=-19 | | 5(2x+4)=-30 | | 6m+2=56 | | -87x-7=-86x-29 | | 2+7t=30 | | 10+2n=10 | | x+9=3(3x-5) | | 10x+14=6x+114 | | 5x+10=6x+17 | | 30=4(4x+1)+10 | | 4k-6=-46 | | 6b+4=76 | | 6t-7=11 | | -6m-2=-26 | | 10-4m=38 | | -x-9=-10 | | 8-8x=19-15x | | -2+4b=-50 | | -4t-8=-44 | | 7+4k=11 | | 7t-6=78 | | -4+5m=-39 | | 5t+9=4 | | -21x-2=14x+68 | | 4(2x-5)=12 | | 4b+1=-47 | | X^3-x^2+4x+48=0 | | 2d+10=-14 | | -2d-9=-19 |