Peter has a card collection. he has 12 baseball cards,24 pokémon cards, and 30 basketball cards. he wants to put t he cards, in equal piles with only one type of card in each pile. how many can he put in each pile?

1. use commutative property to reorder the terms.2x+81=0.2. move the constant to right side by adding its opposite on both sides. 2x+81-81=0-81.2x=(-81).3. divide the equation on both sides.2x ÷ 2 = 81 ÷ 2.x = -81/2. your answer is -81/2. if you need to simplify it into a decimal, it’s -40.5.