# How do you simplify x - 10 + y -2(x + y) + y?

$- 1 x - 10 + 4 y$
$x - 10 + y - 2 \left(x + y\right) + y$
$x - 10 + y - 2 x + 2 y + y$ Here, you solve the parentheses.
$- 1 x - 10 + 4 y$ Then, you combine like terms.