Parentheses are good!
Okay, your equation is . If you go ahead and multiply boht sides by .3- x/2 as you say, you get .
You might as well go ahead and multiply both sides by 4 as well:
[tex]5.76- 9.6x= (1.2+ 2x)^2]/math]
Now multiply out that right side:.5.76- 9.6x= 1.44+ 4.8x+ 4x^2
Solve that quadratic equation for x. Don't forget to put the answers back into the origin