Why does my car pull to the left?

It's a Ford Mondeo if that's relevant.
I've checked the tyre pressure & it's the same in each wheel, & the wheels are all balanced, but I have to force & hold the steering wheel to the right the whole time just to stay in a straight line, otherwise the car veers sharply to the left.

As well as what's causing that problem how could it be fixed?

Get your alignment checked

Get the wheel alignment checked as well as the tie rods. Although tie rods usually only get damage if you got in an accident or hit an enormous pothole or rough surface.

I thing it is the wheel alignment, if you hit something rough or kerb before, the alignment need to be adjust.