$7^3\:.\:3^2$
$102-15x^3$
$\left(\frac{3}{4}x\:^3-\frac{2}{9}x^2\right)^2$
$-270\cdot8$
$\frac{4}{3}\pi\cdot10.5^2$
$\:\left(x+2\right)\left(x+1\right)+\left(x+3\right)\left(x+2\right)-2x^2-8x$
$6a-2a-3a-4a-a$
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