You have a standard deck of cards. The deck has 52 total cards and contains 4 suits: hearts, clubs, diamonds, and spades.

The answer is -pie over 2

Rational number is a real number. 

Hello, your answer would be  add 16.why? simply if you add 16 to both sides, you'll get an equal equation to the precedent one, as the rule says and -16 and +16 are opposites so they both cancel out leaving the x alone.