If it's not what You are looking for type in the equation solver your own equation and let us solve it.
12=7a=4a
We move all terms to the left:
12-(7a)=0
We move all terms containing a to the left, all other terms to the right
-7a=-12
a=-12/-7
a=1+5/7
| X-9=2(x-3)-4 | | (0.75)(5y)=8.25 | | 18=3j—6 | | 6x^2-3x=-7 | | 2x=14=4 | | 4x-×2=60 | | 9x+10=4x+3 | | 3√8x+9=33 | | 6=6x-9 | | -3=13/a | | 6^-n=6^3n | | 1/7x+2/7=14 | | 3x-4=40-4x | | 25+25+4x+2=128 | | 22=f⁄6 | | 13p-2p+2(-3p+4)=50-7+6p | | 39.55x+2.95=26.00x+4.50 | | 12=−59x−6 | | 39x-11=2(17x+6) | | -.5(4x-6)=4x+15 | | 4=3(n-5)=8 | | x-146=15 | | 0.05x+0.49=5 | | a−3=13 | | F(5)=-x^2+9x | | 100=(x-2)^2+x^2 | | 10u+6=9u | | (4x-16)+(5x+7)=x | | (2-i)(8+2i)=0 | | 2+1/3x=6 | | (4x-16)(5x+7)=D | | 6(w+1)=-18 |