$\pi\pi\pi$
$-8\left(2\right)+\left(-4\right)$
$x^2.\left(\frac{1}{\sqrt{2x}}\right)$
$y\left(-1+x\right)+x^2$
$-9b^2+27b^2$
$2x^{2}-2x+6-\left(-3x\right)$
$\left(15x+3y-4w\right)-\left(-2x-y+2w\right)$
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