Answer:
x = 0.286
Explanation:
We start with your equation:

Since we are solving for x , we want to isolate all the x's to one side
![(1)/(2)x [-(1)/(2)x] + 3 = -4x + 15x [-(1)/(2)x]](https://img.qammunity.org/2024/formulas/mathematics/high-school/czbn4krtsgxo83rtlz8bx1jzxpznzdwz8k.png)
leaving us with

then combine like terms

Divide both sides by 10.5 to find X
![3[/10.5]= 10.5[/10.5] x](https://img.qammunity.org/2024/formulas/mathematics/high-school/m9yijy0zg10j4k6ccppzr9v1oja7gzv5b8.png)
x = 0.286
*I've left it at 3, but you can divide 3 by 10.5 to get as many significant digits as you need!