$cos2x+3cosx+2=0$
$x^2=x+20$
$9x^2-2x+36$
$\frac{5^{2-x}}{5^{-x-2}}$
$-17-1+18+6+4+4$
$4\:x\:-\:6\:>\:6x$
$n^2+10n+25$
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