$4x^2-40x+25$
$5c-2h+4hc+2hc+6h-7c+hc$
$tan\left(\frac{x}{2}\right)=csc\:x-cot\:x$
$x\:-\:8\:=\:-5$
$\frac{64-s^3}{8-s}$
$-40-\left(-40\right)$
$5m^2n-3m^2n$
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