5m Zen
2x 7y x 4y
2x 7y x 4y pictures 5
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2x 7y x
2x 7y x 4y
2x 4y 24 x 7y 27
x 4y 2x 7y 15
2x 7y 4y 2 x y
2x 7y 3 x 1 4y substitution
2x 7y 3z x 4y 6z
2x+7y u003d 3 and xu003d-4y
2x 7y x 4y
2x 7y x 4y 3x
