$50\cdot7.5$
$2a-3b-a+2b$
$3\left(b+1\right)\left(b-3\right)$
$\left(a^6b^{-4}\right)^3$
$\left(6-2g\right)^2$
$2x^2y+3xy$
$\left(\sqrt{ab}-2\sqrt{x^4y^3}\right)$
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