$7\cdot a^2\cdot5c$
$\frac{n}{2}+1>-7$
$3t+2t^2$
$25x^2+10x=11$
$xdy+y^2dx=0$
$\frac{9^{7}+6^{7}}{9+6}$
$\left(3x+2y\right)^2-\left(y-4\right)^2$
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