$( x + y - 2 ) ( x + y + 2 )$
$2u-11\le\:\:5u+6$
$x^2+4^4x+102.4$
$2x\left(4x-5\right)=3$
$3^2-6x+9^3$
$\frac{x^2-6x+2}{5-x}$
$\int x^3\left(x^2-7\right)^5dx$
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