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X3 x4 x
X3 x4 x pictures 5
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X3 x4
X3 x4 x
x3 x x4 9
x4 x3 2 x 2
x4 x3 x2 x 1 solution
x4 x3 7x2 x 6
x4 x3 x2 x 1 0
x x2 x3 x4 formula
x x2 x3 x4
x x3 1 3 x4
x4 x3 x2 x 1
x3 x4 x
