$\left(-3x^2\right)\left(2x+2\right)$
$x ^ { 4 } - a ^ { 4 }$
$\int\frac{\sqrt{x}}{\sqrt{x-1}}dx$
$\frac{x-5}{x^2-25}$
$\left(a-7\right)^4$
$a^2-ab\:entre\:\:-3x^2$
$3x\left(x\:-\:y\right)\:-\:2y\left(x\:+\:y\right)\:+\:7\left(2x\:+\:y\right)\:-\:5$
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