$7t-6t$
$\frac{5x^6-x^4}{x^2+1}$
$32y^4z^2+36a^2z+4$
$\frac{x^3+3x^2-3-x}{x+5}$
$9x^3y\:+7\:x^3y$
$\frac{dy}{dx}\:+\:5xy\:=\:3x$
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