$\int_3^{12}\left(\frac{x+x^2}{4}\right)dx$
$9\left(9+5x\right)+5\left(x-8\right)$
$cx=x^2+8x+16$
$6x^2+7x=3$
$200-800$
$25x^2+10\cdot$
$\log\left(\frac{1}{3}\right)x=3$
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