$x^4y+x^2+3x$
$z2\:-\:12z\:+\:36$
$7x+5>19$
$4\cdot4\cdot4\cdot4^2$
$2x^3+5x^2-7$
$\left(x+z^2-ax-az^2\right)$
$\sqrt[3]{3^{15}x^{12}}$
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