$2x+5\cdot4x-3$
$-7w-6w+9-5$
$\left(x^2+6\right)\left(x^2-3\right)$
$\frac{dy}{dx}=\left(\frac{\left(2y+3\right)^2}{4x+5}\right)$
$2x^2+200+100$
$348=-16t^2-23t+486$
$\left(2xy-7\right)^2$
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