5m Zen
7x 3y 15 12y 5x 39
7x 3y 15 12y 5x 39 pictures 5
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7x 3y 15
7x 3y 15 12y 5x 39
7x 3y 15 0 12y 5x 39 0
7x 3y 15 12y 5x 39 by substitution method
7x 3y 15 12y 5x 39 by elimination method
7x 3y 15 12y 5x 39
