Lettervormen herleiden

Herleid de lettervormen

\(-x+2xy-3x-2xy-2x\)

\(\begin{align}-x+2xy-3x-2xy-2x&=-1.x+2.xy-3.x-2.xy-2.x\\&=-1.x-3.x-2.x+2.xy-2.xy\\&=-6x+0xy\\&=-6x\\ \end{align}\)