An equation.
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Two expressions that equal each other is an equation
It is formed by two expressions that equal each other
They are formed by two expressions that are equal to each other.
Equilibrium in math is when you have two expressions that are equal to each other. generally the notation for this is the = sign.
How many sides of each triangle and how many angles of each triangle do you have ? If you have two sides and the angle between them, or two angles and the side between them, equal to the same parts of the other triangle, then your triangles are congruent. You don't even have to know what the actual numbers are. If the expressions are equal, then the sides or angles are equal.