\(\Rightarrow y\left(3x+2\right)=28-3x\Rightarrow y=\dfrac{28-3x}{3x+2}=\dfrac{30-2-3x}{3x+2}=-1+\dfrac{30}{3x+2}\)
Để x,y là số nguyên\(\Rightarrow\dfrac{30}{3x+2}\in Z\Rightarrow30⋮3x+2\) Mà 3x+2 : 3 dư 2
\(\Rightarrow3x+2\in\left\{-10;2;5\right\}\) \(\Rightarrow x\in\left\{-4;0;1\right\}\Rightarrow y\in\left\{-4;14;5\right\}\)