Rewrite each expression using the distributive property and simplify, if possible. See Example 7. 7r - 9r

Rewrite each expression using the distributive property and simplify, if possible. See Example 7. a + 7a

Rewrite each expression using the distributive property and simplify, if possible. See Example 7. x + x

Rewrite each expression using the distributive property and simplify, if possible. See Example 7. 2 (x - 3y + 2z)

Simplify each expression. See Example 8. -12y + 4y + 3y + 2y

Simplify each expression. See Example 8. -6p + 5 - 4p + 6 + 11p

Simplify each expression. See Example 8. 3(k + 2) - 5k + 6 + 3

Simplify each expression. See Example 8. 10 - (4y + 8)