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Solve by Substitution x+4y+5z=18 , z=-7

$x + 4 y + 5 z = 18$ , $z = - 7$

Step 1

$x + 4 y + 5 z = 18, z = - 7$

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

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