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Math·Algebra·Systems of two linear equations in two variables

hard

$7(5x)+9(8y)=189$
$7(5x)-9(8y)=-819$

The solution to the given system of equations is $(x,y)$. What is the value of $5x+8y$?

A

$-101$

B

$45$

C

$11$

D

$56$