$\left(x+7y\right)\left(x-3y\right)$
$\int\frac{-2x}{\left(x^3+x^2+x+1\right)}dx$
$x ^ { 2 } y - 2 y = x ^ { 3 } - 1$
$8-4\left(-3\right)+5\left(-2\right)-1\left(-1\right)$
$10\:por\:10$
$8^2+4x$
$\frac{5x^4+9}{x}$
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