$13x-13=169$
$\sqrt{a^{3}\sqrt{a}}$
$6\left(u+7\right)$
$\frac{4.5}{3}$
$78-136-1824$
$\left[-10x-5y=0\right]\left[21x-7y=28\right]$
$\left(4\sqrt{x}+2\right)x^3$
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