$\left(3x^2+3y^2\right)-\left(2x^3-2y^3\right)$
$\frac{-3y+3}{4}^2$
$-7.9w+6.6w$
$\left(4x^3y-5z\right)\left(4x^3+5z\right)$
$x^2+6x\ge16$
$5x^2+9x-7+-8x^2+10x+15$
$\int_{-8}^{-1}\frac{x-x^3}{2\sqrt{x}}dx$
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