=>9x=-20y+547
=>x=-20/9y+547/9
vậy: \(\left\{{}\begin{matrix}y\in R\\x=-\dfrac{20}{9}y+\dfrac{547}{9}\end{matrix}\right.\)
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=>9x=-20y+547
=>x=-20/9y+547/9
vậy: \(\left\{{}\begin{matrix}y\in R\\x=-\dfrac{20}{9}y+\dfrac{547}{9}\end{matrix}\right.\)