$-2b\left(2b^2+2b+1\right)$
$9f^2+6f+1$
$2sin\frac{1}{5}x=\sqrt{2}$
$9a+10b-6c=-46$
$x^2-3x-1638=0$
$3x^2-6x+1$
$9x<8$
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