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 Challenge
 Operation:  A mathematical process that combines two or more numbers.

Formulaic Properties: Find values of x, y, and z so that a given expression equals 18.

Multiple Solutions: Find the set of solutions of a system of two equations with three variables.

Seven Envy: Use the same whole number and the operations +, -, x, and to produce a certain number.

Multiple Calculations: Place the digits 1 through 9 in the empty boxes in a special way.