$x^2+3x+4x-2x^2-2x+5+3x^2+5x-7$
$\frac{\left(x^2\right)}{\left(x+3\right)^2}$
$100x^2-169y^2$
$32\left(x+1\right)+x$
$\left|2a\right|-\frac{b}{3}$
$\int\frac{2}{3-5\sin\left(x\right)}\:dx$
$4x^2y-12x^2y^3+9xy^3$
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