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)
12 = a/9 // - a/9
12-(a/9) = 0
12-1/9*a = 0 // - 12
-1/9*a = -12 // : -1/9
a = -12/(-1/9)
a = 108
a = 108
| -2x^2+16=0 | | 5(2a+3)-10a= | | 9.3=3n | | 12b=156 | | 63=3p | | -1/3x+5/6x+2=-1/2+1/6x | | 7(5-3n)=161 | | -18f=-9+72 | | -8w+4=-4 | | 6-1(x+1)=2(2-x) | | 28=3m+7 | | y+6=17 | | 20a^2-8ab-28b^2=0 | | 2(6+7x)=-86 | | 4x-x+3=0 | | 16x^2+7y^2=112 | | 9x^2-151x-4878=0 | | 17=n/18 | | -2(8x-2)=-92 | | 2x+-2=6 | | 28=3m-7 | | 7/3+6=-1 | | 4x+5y=-1o | | 4/9p=1/6 | | 3x-4=2-1x | | 4b-6r=2r-4 | | 15x+24(x-5)=231 | | -288=-4(-7-8k) | | 4x+5=4x^2-20x+25 | | 4x+58=158 | | 4/x=14/5x+2 | | 4f-4=f+11 |