$\left(5b^2\right)^{-3}$
$\left(8d^3-9d^2\:\right)\left(-d^2\:+2d\right)\:\left(-4d-7\right)$
$\log x+\log\left(x-1\right)=\log\left(4x\right)$
$-5\cdot\left(-8\right)\cdot\left(-10\right)$
$-40-25u$
$20ab+12ba-15xy+6xy-ab+2yx$
$\left(2r^2s-r^2s^6\right)^2$
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