$\left(x-y\right)+\left(2x-z+3y\right)+\left(5y-4x\right)$
$\frac{8d^2}{2d}$
$\:5y\:-\:6y\:-\:3y\:+\:4y$
$x^2-20xy+100y^2$
$f\left(x\right)=\frac{e^{-x}}{x}$
$5cos6x=2.5$
$\left(4x^3+y^4\right)^2$
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