$106-\left(-38\right)$
$\int\frac{7}{x^2+7x}dx$
$\lim_{x\to5}\left(\frac{x^2+14x+45}{x^2-2x-35}\right)$
$1-5a+45a-35a+5a$
$-8\left(6c+5\right)+7c$
$\infty^{\frac{1}{2}}$
$x^2-\left(y-z\right)^2$
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