Question

1. (7x^{2}y^{2}-6x^{3}+xy)-(5x^{2}y^{2}-x^{3}+xy + x)

Explanation:

Step1: Eliminar paréntesis

$(7x^{2}y^{2}-6x^{3}+xy)-(5x^{2}y^{2}-x^{3}+xy + x)=7x^{2}y^{2}-6x^{3}+xy - 5x^{2}y^{2}+x^{3}-xy - x$

Step2: Combinar términos semejantes

$(7x^{2}y^{2}-5x^{2}y^{2})+(-6x^{3}+x^{3})+(xy - xy)-x$
$2x^{2}y^{2}-5x^{3}-x$

Answer:

$2x^{2}y^{2}-5x^{3}-x$