$2a-3a+2a+5a$
$\int\frac{x}{e^{x^2}}dx$
$x^4+1\ge0$
$xy\frac{dy}{dx}=\left(1+x^2\right)\left(1-y^2\right)$
$\left(8z^2-4yx\right)^2$
$\left(xm\right)^2$
$-\left(-1+4\right)-\left(-7+1\right)$
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