$4\cdot2^2-2^2-7\cdot2-5$
$32a-a^2$
$50z^2+220z+242$
$2x^2-8x+5=0$
$18^{-6}\cdot18^8$
$2^3+2^3$
$\left(\frac{1}{4}d\:-\:\frac{4}{5}\right)^2$
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