$\left(-45\right)\cdot0+20\cdot\left(-11\right)-9$
$4-x+x-6$
$8a^{x+2}b^{x-3}-25a^{x+2}b^x^{+2}$
$x^2-40x+200$
$-15-\left[-9\right]$
$4.29-7.6$
$x^2+21x+9$
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