$-4\left(8-6\right)$
$1\:+\:10r\:=\:10\:+\:9r$
$x^2-10x+21\le0$
$\left(5+6v\right)^2$
$\frac{dy}{dx}\left(x\right)=6x\left(y-1\right)^{\frac{2}{3}}$
$f\left(x\right)=1+7$
$15x^4-5x^3+42x$
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