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Solve by Substitution 4x+7y-z=1 , 5x+9y+z=2

$4 x + 7 y - z = 1$ , $5 x + 9 y + z = 2$

Step 1

$4 x + 7 y - z = 1, 5 x + 9 y + z = 2$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$

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