$-780+550$
$-\left(3c-4\right)\left(8c-5\right)$
$\frac{-2\cos\left(x\right)\left(1-\cos\left(x\right)\right)}{\sin\left(x\right)\left(1+\cos\left(x\right)\right)}$
$70+18-10-15$
$axy-bx$
$\sqrt{175x^2}$
$m^2=20m-96$
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