I need help very badly with number 4.

The transitive property of equality states that: o if a = b, then bra o if a = b, then ac = bc o if a = b and b= c, then a = if a = b and c= c, then a + b = b + c

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]