$-x^2+6=x^2+4x$
$\left(a+2b\right)x^4+\left(2b+a\right)y^3$
$15+w+w+w-3$
$\frac{x^n}{n\sqrt{n}4^n}$
$\sin a=\frac{8}{11}$
$5x^2+6xy=5$
$1\:-3\:1\:3$
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