$x^2+6x+9-8y+xy\left(x-z^5\right)$
$\left(y^2+\frac{1}{2}\right)\left(y^2-\frac{3}{8}\right)$
$x4-8x-9$
$-5x\left(8x-2\right)-2\left(3x+1\right)\left(2x-3\right)+4\left(5x-2\right)^2$
$34ax^3-51a^2x^3$
$cos\left(4x\right)=1$
$31.951+-2.38$
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