$3n^2+9n-30$
$\left(4x+3y-5z\right)^2$
$\tan x+4\cot\tan x=5$
$4x^4\cdot2$
$\frac{14x-24-2x^2}{x^2+x-20}$
$5x+10y-15$
$\frac{1000m^6+8x^3}{10m^3+2x}$
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