ax+bx+ac+bc=(a+b)x+(a+b)c=(a+b)(x+c)
6x+7y+42+xy=6x+xy+7y+42=(6+y)x+7(y+6)=(x+7)(y+6)
3a-3c+xa-xc=3(a-c)+x(a-c)=(3+x)(a-c)
px+py-5x-5y=p(x+y)-5(x+y)=(p-5)(x+y)
4a+by+ay+4b=4a+4b+by+ay=4(a+b)+(b+a)y=(4+y)(b+a)
ab-ac-4b+4c=a(b-c)-4(b-c)=(a-4)(b-c)
ax+bx+ac+bc=(a+b)x+(a+b)c=(a+b)(x+c)
6x+7y+42+xy=6x+xy+7y+42=(6+y)x+7(y+6)=(x+7)(y+6)
3a-3c+xa-xc=3(a-c)+x(a-c)=(3+x)(a-c)
px+py-5x-5y=p(x+y)-5(x+y)=(p-5)(x+y)
ax+bx+ac+bc=(a+b)x+(a+b)c=(a+b)(x+c)
6x+7y+42+xy=6x+xy+7y+42=(6+y)x+7(y+6)=(x+7)(y+6)
3a-3c+xa-xc=3(a-c)+x(a-c)=(3+x)(a-c)
px+py-5x-5y=p(x+y)-5(x+y)=(p-5)(x+y)
4a+by+ay+4b=4a+4b+by+ay=4(a+b)+(b+a)y=(4+y)(b+a)
ab-ac-4b+4c=a(b-c)-4(b-c)=(a-4)(b-c)