$x+x^2-x^3$
$x_{n}+\frac{x}{x}$
$\left(2x+1\right)\left(2x-1\right)+\left(y+7\right)\left(y-7\right)$
$n\:+10+9n-3$
$18-x<21x-26$
$-2+\sin\left(x\right)=-3$
$\sin\left(\frac{1}{\cos\left(\frac{1}{5}\right)}\right)$
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