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Solve for both variables $a$ and $b$:

$3a+4b=6$
$2a+7b=17$.

A

$a=2$ and $ b=-3$

B

$a=2$ and $b=3$

C

$a=-2$ and $b=3$

D

$a=-2$ and $b=-3$

E

None of these answers is correct.

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