$81a^2+108ab+36b^2$
$5x^2-40x+35=0$
$4\left(\:a\:+\:b\:+\:2\right)$
$\tan\left(t\right)=-1$
$4-3\left(-5\right)+7-2$
$-806-928$
$-n^2+100n+1$
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