$1+8+\left|-5\right|+4$
$3-9\cdot6+4$
$3x+9=4x+5$
$\frac{-2x^3+7x^2+9x}{x}$
$\frac{dy}{dx}=\left(x^2+4x-7\right)\left(4x^3-3x\right)$
$100x^2-4$
$25f^2-36a^4$
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