\(
\eqalign{
& x^7 \cr
& \left( {x + 1} \right)^3 \cdot x \cr
& x^4 + 3x^3 + 3x^2 + x \cr
& \left( {x + 1} \right)^2 + 3x\left( {x + 1} \right) + 3(x + 1) + x \cr
& x^2 + 2x + 1 + 3x^2 + 3x + 3x + 3 + x \cr
& 4x^2 + 9x + 4 \cr
& 4(x + 1) + 9x + 4 \cr
& 4x + 4 + 9x + 4 \cr
& 13x + 8 \cr}
\)
