$4^2-4+5$
$\frac{8d^2}{2d}$
$\left(37\right)\left(-8\right)$
$29\cdot20$
$0.000003x^2-0.04x-\frac{70000}{x}$
$\frac{12x^2-6x+2}{3}$
$64y^2+81x^4+144x^2y$
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