$9^2.9^2\cdot9$
$-4xdx+\left(yx^2-3y\right)dy=0$
$54.3=\frac{x^2}{\left(0.15-x\right)\left(0.09-x\right)}$
$2y-y+7-1+3+7x^2-4y$
$\frac{x}{x-1}\le4$
$x^2-x-3;\:x=0$
$\left(x^2y+7\right)\left(x^2y-7\right)$
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