$\ln\left(9x\right)$
$x-2y=-4$
$4a^3b^0\cdot4ba^3$
$\frac{-20x^3y^8}{5x^7y^2}$
$6+2-6-7-7a$
$x^2-15x+108$
$\lim_{x\to0}\left(\frac{6\cos\left(3x\right)}{5x}\right)$
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