Answer & Step-by-step explanation:
On the left:
There are 4 triangles that indicate -x, so this is -4
There are 3 circles that indicate -1, so these are -3.
Insert as an expression:

On the right:
There are 2 triangles that indicate -x, so this is -2x.
There are 2 circles that indicate -1, so these are -2.
Insert as an expression:

Combine both expressions into an equation:

Solve for x. Add 3 to both sides:

Add 2x to both sides:

Isolate the variable. Divide both sides by -2:

:Done