$-3x-\left(-2\left(x-3y\right)-4\left(-3x-2y\right)\right)$
$-\frac{2}{3}+4x\ge0$
$3x^2+5x+9$
$\lim_{x\to\infty}\left(\frac{-82x^3+29x^2+50x-56}{-10x^2+31x-70}\right)$
$\frac{x^2+3x}{2}$
$\left(2xy^4+2xy^2\right)dx+\left(x^2y^3+x^2y\right)dy=0$
$x^2\left(a-b\right)+9\left(a^2+b^2\right)$
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