$\int_2^7\left(y^2-4x-6y+1-\left(2x+3\right)\right)\:dx$
$\frac{1+3^3}{1+a}$
$-3x^2+6x+9<0$
$2x-3\left(5x-2\right)$
$4m-6m-12m+4m-5m-2m+m$
$\left(49-4.1\right)\cdot3$
$5500\:-4300$
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