$7^55\:x\:7^{-2}$
$3x+5x-2x-9x$
$\left(-\frac{1}{9}y-1\right)\left(-\frac{1}{9}y+1\right)$
$\sqrt[3]{2401b^5}c$
$\left(-b-c\right)\left(b-c\right)$
$8\cdot\cos\left(36.87\right)$
$\left|-\frac{4}{16}\right|.$
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