Math Mixed Operation

	This puzzle program is called 'Magic Square'. You need to make the sum of each line (three numbers each line and eight lines altogether) is equal to the key you entered.
	This is an arithmetic puzzle program. You are required to fill in the blanks to balance the left side with right side.
	In this program, you are required to select the correct math operator to finish each operation.
	This program is designed to test your skills of doing the mixed operations.
	In this program, you are required to do the operation of addition or subtraction with the knownledge of graph.
	In this program, you are required to do the operation of addition or subtraction by filling in the blanks.
	In this program, you are required to do the operation of addition or subtraction by filling in the blanks.

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