$-42\cdot7$
$x^a.x^{2a}.x^a.x^{2a}$
$3^2.\:3^{-3}$
$8a+1<-7$
$\left(6x+3y\right)x\left(x+y\right)$
$1-25a^2b^2$
$3g^6\left(4-2g\right)$
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