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Use Gaussian elimination to solve the system of equations.
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Q67: <span class="ql-formula" data-value="\text {Multiply.}"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mtext>Multiply.</mtext></mrow><annotation
Q67: <span class="ql-formula" data-value="( 2 , - 4
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