$\left(7x^4-6x^2+5x-3\right)+\:\left(-3x^4+8x^3-5x^2+4x+6\right)$
$\frac{72x^5}{-3x^2}$
$2x+3y+4z=9$
$\int x^{3\:}\left(x^2+4\right)^{0.5}dx$
$3x^2+10x+8$
$f\left(x\right)=x^6cos\pi x$
$2x^2-3\ge4$
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