$\left(7\right)\cdot\left(3\right)$
$x^2+xy+y^2\:\:por\:x-y$
$\frac{x-1}{x^2-1x}$
$5r^2+15r$
$\int_1^{\infty}\left(\frac{x+1}{x}\right)dx$
$\left(2a+6\right)\left(x\right)-6$
$\lim_{x\to5}\left(\frac{x^2+14x+45}{x^2-2x-35}\right)$
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