Necesito ayuda con el precedimiento de esta ecuación por favor x - [5 + 3x - {5x - (6 + x)}] = - 3?

Desarrollo :

<img src="https://tex.z-dn.net/?f=X-%5B5%2B3x-%285-%286%2Bx%29%29%5D%3D-3%20" />

<img src="https://tex.z-dn.net/?f=X-%5B5%2B3x-%20%28%205-6-x%29%5D%3D-3" />

<img src="https://tex.z-dn.net/?f=X-%5B5%2B3x-%20%28%20-1-x%29%5D%3D-3" />

<img src="https://tex.z-dn.net/?f=X-%5B5%2B3x%2B1%2Bx%29%5D%3D-3" />

<img src="https://tex.z-dn.net/?f=X-%5B4x%2B6%5D%3D-3" />

<img src="https://tex.z-dn.net/?f=X-4x-6%3D-3" />

<img src="https://tex.z-dn.net/?f=-3x-6%3D-3" />

<img src="https://tex.z-dn.net/?f=-3x%3D-3%2B6" />

<img src="https://tex.z-dn.net/?f=-3x%3D3" />

<img src="https://tex.z-dn.net/?f=x%3D-1" />.