what rational number should be added to _5/7 to get 3/4
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Let the number x be added.
3 ( - 7/4) + x = 3/7
On solving the equation
—21/4 + x = 3/7
x = 3/7 + 21/4
x = (12 + 147) / 28
x = 159 / 28
x = 5 19/28
The number is 5 and 19/28
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