(5а-ах+х²)+(За²+2аx-3x²)-(4ax+2ax²+a²)=5a-ax+x2
+(3а2+2ax-3x2)-4ax-2ax²-a2=5a-ax+x2+3a2+2ax-3
x²-4ax-2ax²-a²=5а-Зах-2х2+2a2-2ax2
(5а-ах+х²)+(За²+2аx-3x²)-(4ax+2ax²+a²)=5a-ax+x2
+(3а2+2ax-3x2)-4ax-2ax²-a2=5a-ax+x2+3a2+2ax-3
x²-4ax-2ax²-a²=5а-Зах-2х2+2a2-2ax2