$4y\left(b-z\right)-x\left(b-z\right)$
$16-\left(-25-3\right)$
$2\log_{3}5=\log_{3}\square$
$-2\sin\left(\frac{x}{2}\right)\cos\left(\frac{x}{2}\right)-\cos\left(x\right)$
$-2\cdot19$
$\frac{\sqrt{x}-x}{x-\sqrt{x}}$
$m+4-2m$
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