$3x+6x\:+9$
$\frac{k}{-8}=20$
$\frac{2}{x-1}-\frac{6}{2x+1}=5$
$7bc^2-11bc^2$
$\sqrt[3]{2}^{-9}$
$t^3\frac{dy}{dt}+4y^2=0$
$a^2-23a+42$
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