$\frac{k}{7}=10$
$\left(9x\:+2y\right)^2$
$\left(3w\right)\left(w+4\right)\left(w-2\right)$
$\frac{16a^3+24a^2+6a+20}{2a+3}$
$\left(9a^2+4b+2c\right)^2$
$x+y=2z-3y$
$y^2-2y+2=0$
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