$\left(2x^2+x-1\right)\cdot\left(x-3\right)-\left(2x-1\right)\cdot\left(2x+1\right)$
$x^2\left(x+y\right)+y^2\left(x+y\right)$
$2x\cdot3ax$
$x^2-36=-11$
$x^2+4x+4=225$
$\int\frac{2+ax}{4}dx$
$-16t^2+12t+900$
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