$\left(-31-56\right)+\left|57+\left(-78\right)\right|$
$16x^2-40xy+25y^2$
$\frac{1}{tanx+secx}=\:secx-tanx$
$\frac{x^6-27}{x^2-3}$
$\left(-3\right)\left(-5\right)\left(+2\right)+\left(-4\right)\left(+3\right)\left(2-2\right)-\left(-3\right)\left(1-3\right)$
$22\:.\:-21$
$6\left(x-3\right)-3\left(2x-7\right)$
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