M³-n³+2n-2m=(m-n)(m²+2mn+n²)+2n-2m
3a³-3b³+5a²-5b²=3(a-b)(a²+2ab+b²)+5(a-b)(a+b)
x⁶+y⁶+x²+y²=(x²+y²)((x²)²+2x²y²+(y²)²)+(x+y)(x+y)
a³-b³+a²-b²=(a-b)(a²+2ab+b²)+(a-b)(a+b)
x⁴+xy³-x³y-y⁴=x(x³+y³)-y(x³-y³)=x(x+y)(x²-2xy+y²)-y(x+y)(x²-2xy+y²)
a⁴-a³b+ab³-b⁴=a³(a-b)+b³(a-b)