Error, mismatched multiple assignment of n variables on the left side and m value(s) on the right side
The assignment operator (:=) assigns the value of the right-hand side to the left-hand side, where the left-hand side must be a name, indexed name, function call, or sequence of these, and the right-hand side is an expression or sequence of expressions. Assigning a sequence of names on the left-hand side of the assignment operator to a sequence of values on the right-hand side is known as multiple assignment. If the left-hand side is a sequence of names, the right-hand side must evaluate to a sequence of expressions with the same number of members as the left-hand side.
Trying to assign the value 5 to x and y
Error, mismatched multiple assignment of 2 variables on the left side and 1 value on the right side
In any multiple assignment, the number of elements on the left-hand side must equal the number of elements on the right-hand side or else Maple will not know how to proceed with the assignment.
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