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

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$$\begin{gathered} 5x+5y=150 \\ x+y=2x \end{gathered}$$

If the solution to the given system of equations is $(x,y)$, which of the following equations is true?

A

$2x=5$

B

$2x=30$

C

$2x=145$

D

$2x=150$