$81 u ^ { 4 } - 18 u ^ { 2 } w ^ { 3 } + w ^ { 6 }$
$4x^2-12x-9\ge0$
$2x^2+3x+20$
$2am^2n-am2n$
$2y+14=28$
$12-9,7$
$\frac{d}{dx}ax^2+x+5$
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