The Distributive Property and Combining Like Terms

Simplify the following expression:
 $2\left(3x+4\right)$  

Simplify the following expression:  $-3\left(4x+7\right)$  

Simplify the following expression:  $-\left(2y-5\right)$  

Simplify the following expression:  $6x+8-4x$  

Simplify the following expression:  $2x^{ }+5-7x^{ }-8$