$\left(x+2y\right)+3z=x+\left(2y+3z\right)$
$x+2\ge3$
$\left(2xy^6\right)^3$
$\int\left(x^2+2\right).\left(\sqrt{4-x^2}\right)dx$
$\left(8x^2-9nx^6\right)^2$
$12\cdot\frac{3}{4}$
$\:\left(x+\:a\right)^2-2\left(x+a\right)+1-\left(x^2-2x+1\right)$
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