This document contains a series of equations with increasing numbers of addition signs on the left side of the equal sign and an x variable on the right side. Each line adds another plus sign to the left side, showing that adding more terms results in a greater total.

1. BIDERKETA TAULAK
_ x _ = _
_=_x_= _
_+_=_x_=_
_+_+_=_x_=_
_+_+_+_=_x_=_
_+_+_+_+_=_x_=_
_+_+_+_+_+_=_x_=_
_+_+_+_+_+_+_=_x_=_
_+_+_+_+_+_+_+_=_x_=_
_+_+_+_+_+_+_+_+_=_x_=_
_+_+_+_+_+_+_+_+_+_+=_x_=_