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

hard

Which system of linear equations has no solution?

A

$-4x+2y=-7$
$4x-2y=7$

B

$4x-2y=7$
$5x+3y=8$

C

$4x-2y=7$
$-12x+6y=-21$

D

$-4x+2y=7$
$8x-4y=14$