$\left(-3\right)\left(-2\right)\left(7\right)\left(-5\right)$
$-2^7$
$\log_{90}\left(90^{-4}\right)$
$a^2\cdot2ab-b^2$
$2x+2a,para\:x=\:6\:y\:a=4$
$\sqrt{3x^5}-2$
$y=\frac{\left(x+3\right)^2}{5}$
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