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\[\begin{aligned}&y={x}^{2}-3x+4\\&x+y=4\end{aligned}\]
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y=x^2-3x+4;x+y=4
y=x^2-3x+4; x+y=4
\begin{aligned}&y={x}^{2}-3x+4\\&x+y=4\end{aligned}
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