A) \[\text{m}+\text{n}=\text{7}\]\[\text{3m}+\text{3n}=\text{21}\]
B) \[\text{3x}-\text{2y}=\text{5}\]\[\text{2x}-\text{3y}=\text{7}\]
C) \[\text{3x}-\text{3y}=\text{18}\]\[\text{x}-\text{y}=\text{1}0\]
D) \[\text{2x}+\text{y}=\text{6}\]\[\text{4x}-\text{2y}=\text{4}\]
Correct Answer: A
Solution :
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