$\frac{\pi32}{\pi4}$
$2\cdot4+4\cdot2$
$-6x-3\left(1+9x\right)$
$\left(4xy^7\right)^3$
$a+3b-2c-4a+c-5b+2a+b-2c$
$5\cdot\left(9x-8\right)^2\left(x+4\right)$
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