$\left|2a\right|-\frac{b}{3}$
$\lim_{x\to1}5x+2$
$2x^2\cdot\:\:x^3\cdot\:3x^5:-6x$
$7a^2+5a-3=0$
$6x^2y\cdot7xy^2$
$x^4-x^2y^2$
$3-4-2\cdot5-11-18$
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