$-\left(-5+7\right)-\left(4-\left(-6\right)\right)+12$
$\left(3x^2y\right)^0$
$\left(23\right)-\left(43\right)-\left(18-54\right)$
$\left(4x-2y\right)\left(6x-9y\right)$
$\int\frac{5x+81}{x^2-81}dx$
$m^2-6m-27=0$
$10=\frac{b}{15}-2$
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