ax+yx+yx+y+ab−xb-xb−x = ax+y+b−xx+y+b-xx+y+b−x = ay+by+by+b
b2x−5y2x-5y2x−5y-b3x−y3x-y3x−y = b2x−5y−3x+y2x-5y-3x+y2x−5y−3x+y = b−x−4y-x-4y−x−4y
2ca+ba+ba+b+c5a−3b5a-3b5a−3b = 2ca+ba+ba+b+c5a−3b5a-3b5a−3b = 2ca+2cb+5ac-3bc = 2ca+5ac+2cb-3bc = ac2+52+52+5+bc2−32-32−3 = 7ac-3bc
x2x+7y2x+7y2x+7y-x3x−5y3x-5y3x−5y = x2x+7y−3x+5y2x+7y-3x+5y2x+7y−3x+5y = x2x−3x+7y+5y2x-3x+7y+5y2x−3x+7y+5y = x−x+12y-x+12y−x+12y
ax+yx+yx+y+ab−xb-xb−x = ax+y+b−xx+y+b-xx+y+b−x = ay+by+by+b
b2x−5y2x-5y2x−5y-b3x−y3x-y3x−y = b2x−5y−3x+y2x-5y-3x+y2x−5y−3x+y = b−x−4y-x-4y−x−4y
2ca+ba+ba+b+c5a−3b5a-3b5a−3b = 2ca+ba+ba+b+c5a−3b5a-3b5a−3b = 2ca+2cb+5ac-3bc = 2ca+5ac+2cb-3bc = ac2+52+52+5+bc2−32-32−3 = 7ac-3bc
x2x+7y2x+7y2x+7y-x3x−5y3x-5y3x−5y = x2x+7y−3x+5y2x+7y-3x+5y2x+7y−3x+5y = x2x−3x+7y+5y2x-3x+7y+5y2x−3x+7y+5y = x−x+12y-x+12y−x+12y