$-12\left(n-3\right)=-11n+50$
$\frac{d^2}{dx^2}\left(\frac{1}{3-2x}\right)$
$\frac{25xy}{5xy}$
$\left(3\sqrt{x}-2y^2\right)^2$
$x^2+9x=16$
$2eso:2a$
$3\left(x-2\right)+5x=2\left(3x-6\right)+12$
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