$\frac{1}{x^2}-x$
$4-7\cdot4-1$
$\frac{1}{125}+\frac{343n^3}{512}$
$8x\left(x+2\right)$
$xy'\:=\:-x-y$
$-1-x=1.2$
$\left(8m-5n\right)\left(8m+5n\right)$
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