$25x-100^4$
$\frac{5.5}{10}$
$x2+16x=24$
$\left(5r-3t\right)\left(-3t+5r\right)$
$2\tan^2x+3=2\sec^2x+1$
$q^2+8q-9$
$7.\:4\:\left(-18\right)$
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