$3+4x+4x^2$
$5^2\cdot e^2$
$\left(15x^2-4y\right)\left(15x^2+4y\right)$
$4m+-5n-m-3n$
$\frac{dy}{dx}+\frac{1}{50}y=0.8$
$2x-5^3$
$\left(1.5m+2n+z\right)^2$
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