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IF (5sqrt3+sqrt7)/(4sqrt3-2sqrt7)=a+bsqr...

IF `(5sqrt3+sqrt7)/(4sqrt3-2sqrt7)=a+bsqrt21` then (a,b) is

A

`(-37/10,7/10)`

B

`(-37/10,-7/10)`

C

`(37/10,-7/10)`

D

`(37/10,7/10)`

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