$4x^2-8x+6$
$-15\cdot5$
$\frac{2}{x}-\frac{3}{x+3}$
$16m^8+6x^3yz-10xy^2w$
$f\left(x\right)=\left(\left(x^2+3\right)^5+x\right)^2$
$7k\:-2\left(3k\:+1\right)\:-\:4$
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