$2n^2-40n+200$
$x^3y-y^2=-y^2$
$9+9\cos x=6\sin^2x$
$16a^2+20a$
$\int\left(\frac{1}{6x+3}\right)dx$
$5x-3=3x-17$
$x^2+2xy-36+y^2$
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