Final Answer
$et^2x\left(\left(q-3\right)\left(q-4\right)+\left(q-3\right)\left(q+4\right)\right)$
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Step-by-step Solution
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Simplifying
$et^2x\left(\left(q-3\right)\left(q-4\right)+\left(q-3\right)\left(q+4\right)\right)$
Final Answer
$et^2x\left(\left(q-3\right)\left(q-4\right)+\left(q-3\right)\left(q+4\right)\right)$