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\[\begin{aligned}&8-0.9x=0.4y\\&-y+0.3x=1.6\end{aligned}\]
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8-0.9x=0.4y;-y+0.3x=1.6:substitution
8-0.9x=0.4y;-y+0.3x=1.6
\begin{aligned}&8-0.9x=0.4y\\&-y+0.3x=1.6\end{aligned}
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