$63=9\left(t+5\right)$
$\int\frac{2x}{\left(x+1\right)\left(x^2+2x+3\right)}dx$
$-3a+4b-6a+81b-114ab+31a-a-b$
$p^2+6p+4$
$\lim_{x\to7}\left(x^3\right)$
$\int\frac{x+2}{x\left(x^2-4\right)}dx$
$3-3\left(4-4\left(3-7\right)+1\right)$
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