$x^2\cdot y-x\cdot y+4x^2-4x$
$\frac{x^2}{x^2+1}=1$
$-23=3u+9-11u$
$3x+2b-4b$
$-3^{-3+2}$
$f\left(x\right)=-\frac{x^{15}}{\left(x+5\right)^2}$
$\int2x\:sin\left(x-9\right)\:dx$
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