$9x^2-9x+2=0$
$\int2\tan6x\:dx$
$c^2+18+81$
$y^2+6y^3-8\:restar\:2y^4-3y^2+6y$
$6x^2-13x-5$
$5x-1+\left(5x+2\right)$
$6x^2=121$
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