$-a-5b;a=4;\:b=3$
$20x^2-148x+177$
$19-\left(-3\right)\cdot\left(5-\left(8\right)\right)$
$-6+\left(-1\right)^4$
$z^2-16z$
$\sqrt[4]{6.561}$
$x^2+\frac{2}{x}+1$
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