$\int\frac{\left(x+3\right)}{x^2+25}dx$
$\int\frac{\left(x^4+1\right)}{2x^2}dx$
$\frac{z}{z}$
$a\left(x+1\right)+c.\left(x+1\right)$
$ax+ay+x+y$
$\:\left(-\:2\right)^7+\:\left(-\:3\right)^4+\:\left(-\:4\right)^3\:+\:\left(-\:11\right)^2$
$\sqrt{x+6}=\sqrt{4x-3}$
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