Multiplicative
Property of Equality
The formal name for the property
of equality that
allows one to multiply the same quantity by both sides
of an equation.
This, along with the additive
property of equality, is one of the
most commonly used properties for solving equations.
Property: 
If a = b then a·c
= b·c. 
Example: 
x/5 = 7
(x/5)·5 = 7·5
x = 35 
