Find the value of x+yx + yx+y for the system of linear equations: {0.4x−0.3y=1.70.3x+0.2y=1.7\begin{cases} 0.4x - 0.3y = 1.7 \\ 0.3x + 0.2y = 1.7 \end{cases}{0.4x−0.3y=1.70.3x+0.2y=1.7
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