$1x^2-4x+4$
$-8x+1+12-4x-8$
$x+20<8$
$\sqrt{48a^6}b^9$
$\int9\left(9x-1\right)^4dx$
$3a-5b-8a-b-a-2b-5b-6a$
$3k^2+12k-9=0$
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