$\frac{x}{\left(x^2+1\right)}=0$
$\int2000\left(1+0.2x\right)dx$
$2x^2-4xy$
$8\left(x-1\right)-3x\left(4-x\right)+6\left(x+2\right)-3$
$\int\left(x^3\cdot\left(1-x^2\right)^{-\frac{1}{2}}\right)dx$
$( 2 b + 2 ) - 3 ( 7 b - 4 )$
$x+3\le5$
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