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If T is a common tangent to the curve `C_1:x^2/4+y^2/9=1 , C_2:x^2/42-y^2/143=1` which does not passes through the fourth quadrant. If T touches `C_1` at `(x_1,y_1) and C_2` at `(x_2,y_2)` then `(2x_1+x_2)` is equal to

A

20

B

30

C

40

D

50

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