$\left(\frac{5}{3}x+\frac{7}{9}y^2\right)^2$
$5a^2-3ab;\:a=3\:y\:b=2$
$10\left\{\left(5x+2\right)\left(5x-2\right)+\left(x-5\right)\left(x+6\right)\right\}$
$cy+2x=3$
$87\cdot3$
$8+3\cdot5^2-7^2$
$\left(4+x\right)\frac{dy}{dx}=5y$
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