$z^2-z-6$
$6x^2+11x=9x^2+20x$
$\cos\left(\frac{4}{5}+\left(-\frac{12}{13}\right)\right)$
$18x+8$
$x^3-2x^2-42x$
$2x^3+6x^3-x^3$
$\ln\left(k\right)=x$
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