$-21+75+\left[32\right]+65$
$-a+b-c+8+2a+2^{b-19}$
$\lim_{x\to0}\left(\frac{\left(x+y\right)^2}{x^2+y^2}\right)$
$1203^2$
$-4\cdot2-\left(14\right)$
$\lim_{x\to0}\left(\frac{4e^t-4}{t^2}\right)$
$4ab+13bc$
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