$7d+3d$
$\frac{3.023}{6.8}$
$3.2\cdot0.8$
$\left|2+3\right|$
$x+9=13$
$\left(\frac{1}{100}\right)^2\cdot\left(0.1\right)^{-4}$
$\left(3x^3-2x^2+x-5\right)+\left[\left(x^3+3x\right)-\left(x^2-x+2\right)+\left(-x^3+2x^2-3\right)\right]$
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