$\frac{x^3}{x^{-1}.x^5}$
$\left(x^4+3x\right)\left(x^4+2\right)$
$-2x-4>10$
$52.385-2.7$
$\left(x^8\right)^2-1$
$x^2+10x=39$
$11+2^2-2$
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