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X y 1 0 3x 2y 12 0 substitution method
X y 1 0 3x 2y 12 0 substitution method pictures 5
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X y 1 0 3x
X y 1 0 3x 2y 12 0 substitution method
x y 1 0 3x 2y 12 0 substitution method
