r=[A]m[B]n APPLEX
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equation
'xy11' is NOT an equation, because it is not equated to anything. It is an algebraic EXPRESSION.
Expression has no answer. a equation has an answer
If there is no = sign it is an expression but if there is an = sign it is an equation
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.