$55-60-58+6-16$
$\left(3a^2+4a^ab^3\right)^2$
$-6.50+3.75$
$\lim_{x\to-2}\left(\frac{x^2-1}{2x+4}\right)$
$5x-7=-7$
$\sqrt { x + 16 } - \sqrt { x } = - 2$
$324.6+273+68.9$
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