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Consider this system:

$\cfrac { 2 }{ 3 } x+\cfrac { 3 }{ 4 } y=10$
$\cfrac { 1 }{ 3 } x-\cfrac { 1 }{ 4 } y=5$

What is the value of $ 2x+y $?

A

$30$

B

$15$

C

$60$

D

$0$

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