Lettervormen herleiden

Herleid de lettervormen

\(-x+3xy+4x+xy+x\)

\(\begin{align}-x+3xy+4x+xy+x&=-1.x+3.xy+4.x+1.xy+1.x\\&=-1.x+4.x+1.x+3.xy+1.xy\\&=4x+4xy\\\\ \end{align}\)