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Solve by Substitution x+3y+z=76 , 7y+2z=28

$x + 3 y + z = 76$ , $7 y + 2 z = 28$

Step 1

$x + 3 y + z = 76, 7 y + 2 z = 28$

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

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