$2\left(7\right)+8$
$13 x ^ { 5 } ( 7 x ^ { 2 } y ^ { 3 } )$
$\int\frac{3x}{\sqrt{3x^2-1}}dx$
$\int\frac{t-1}{t^4-6t^3+9t^2}dt$
$7\cdot7\cdot17$
$3\sqrt{\frac{a^x}{2}}\cdot\:2\sqrt{\frac{a^{x-3}}{5}}$
$\left(x+18\right)\left(x+9\right)$
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