If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3-9a=0
We move all terms containing a to the left, all other terms to the right
-9a=-3
a=-3/-9
a=1/3
| x+3=x+18 | | -1x-15=-2x-15 | | T=4x2+3 | | x+31+90+70=180 | | 4+x=5-2x | | 04x=18 | | x-10+4x+25+x+5=180 | | 12/1+2x=3 | | 121+2x=3 | | a^2+a^2=56.25 | | 2x=180°-55° | | 2x=180°-55 | | 3+5y=14+3y | | 10/x+8=-2 | | 27=13x | | 5w+13=w-19 | | 6q+4=70 | | b-9=-1 | | t-12=1 | | 4r+11=27 | | 5(f-1)+1=(2F+1) | | 5z+5=35 | | 16-5u=2u-19 | | 5(u-2)-1=3(u+1)+4 | | 5x-1/5=94/5 | | 10x–3=8x+27 | | 6v+11=71 | | 8x-3=x+6 | | 9x-12/3=2x | | 1/3(3/4n-15)=1 | | 0.4(2n+3)=13.2 | | 8f-15=f+13 |