$6\cdot6\cdot6+6\cdot6\cdot6\cdot6\cdot6$
$n^2+11n$
$\left(49-x\right)^2$
$0.142a\:+\:0.142b\:=\:0.142b$
$g^7\cdot g^3$
$s^2+2s-8$
$\left(\frac{2}{3}\cdot x\right)\cdot\left(1+5x\right)$
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