what should be added to twice the rational number -7/3 to get 3/7
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(-7/3) ×2 + X = 3/7
X = 3/7 + 6/7
X = 9/7
so 9/7 should be added
X = 3/7 + 6/7
X = 9/7
so 9/7 should be added
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