Question

3(x + y) + 4(x – y) – 7(x – y)

Answer 1

$\bold{Hola!}$

$3\left(x+y\right)+4\left(x-y\right)-7\left(x-y\right)$

$3\left(x+y\right)-3\left(x-y\right)$

$3x+3y-3\left(x-y\right)$

$3x+3y-3x+3y$

$6y$

Saludos!!

Answer 2

=3x + 3y + 4x – 4y – 7x + 7y

=3y + 3y

=6y