$\frac{x^3-8}{2x^2}$
$\frac{1}{2}\left(-2\right)-1$
$\sin^2\left(4x\right)$
$2x+4y-5z=9$
$3\left(2a+b\right)-4a\left(b+c\right)-2c\left(a-b\right)$
$85,321-81,32$
$36a^4b^3-49b^4x^2$
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