$\left(m-3\right)\left(m+5\right)$
$x2\:-20+x\::\:x+5$
$1-\cos\left(3\right)\sin\left(3\right)$
$6\left(x-7\right)$
$\left(4a+4\right)\left(3a-9\right)$
$x^2-4x+1=\:0$
$-2\left(-5\right)^22-5\left(-4\right)+22$
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