5m Zen
2x 4y 7y 1
2x 4y 7y 1 pictures 5
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2x 4y
2x 4y 7y 1
2x 3 4y 1 )u003d 7y 9
2x 7y 3 x 1 4y substitution
2x 7y 1 2x 4y 12
2x 7y 34 5x 4y u003d- 1
2x 4y 7y 1
