$6x-3y+6-2x+12y-14$
$673-240$
$-x^2+13x+12$
$-\left(2-3\right)$
$3\frac{1}{2}\left(9\frac{1}{2}+3\frac{1}{2}\right)$
$-3298-3209$
$4x^4-144y^4$
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