$6=n-4$
$x^2+17x+60$
$\int\left(\frac{x}{\sqrt{x^2+z^2}}\right)dx$
$x^2+4y^2=1$
$x^2y^2-9z^2$
$2x^2+3=7x$
$\int\frac{1}{x^2+8x+18}dx$
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