$\frac{x^2-5x}{5-x}$
$-5x.\left(4x^3+3x^4\right)+\left(-14x^7\right):\left(7x^2\right)$
$x-\frac{1}{x}=6$
$\int_{-3}^24xdx$
$11=2-3x$
$7\sin^2x-4\sin x=1$
$121m^4-4$
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