$s+s^2$
$2x+7+4x-2$
$7x+31x$
$x^3+3x^2-25x-75$
$\frac{y'}{y}=2$
$\left(3a+1\right)\left(1-3a\right)=1-9a^{2}$
$-2x\:\:+\:\frac{4}{5}\:<\:0.5x\:-\:2.2$
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