$7+3r<4$
$5x^2+4x$
$\sqrt{\left(-2^3\right)}^4\:x\:\left(-1\right)^9$
$2x\left(x+4y\right)$
$\left(2x-5\right)^2$
$\lim_{x\to0}\left(\frac{x+2}{2x}\right)$
$3m^2n+9n^2+3n$
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