$20-25+14\left(-3\right)$
$\left(3^{2}\right)^{3}x^{3}$
$\left(4a^2-7ab\right).\left(2a^3\:b\right)\:\:\:\:\:\:\:$
$\log\left(10x^3\right)$
$\frac{7^{-4}}{7^{-9}}$
$\left(\left(-6\right)^5\right)^2$
$4ab+d=13$
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