$121+21a\left(2\right)b\left(2\right)+a\left(4\right)b\left(4\right)$
$3m^2-3$
$\left(x+5y^3\right)^2\left(x+5y^3\right)$
$2x\le18$
$\int x\left(0.6+\frac{0.1}{\sqrt[3]{x}}\right)dx$
$n^2\left(b^2-1\right)-4\left(b^2-1\right)$
$5x^2y\:12x^2y$
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