$121-100x^2$
$\frac{3}{5}x+\frac{2}{5}+\frac{3}{5}x$
$\frac{dy}{dt}+2ty=0$
$-11x^2y^2+x^2y^2+\frac{3}{4}x^2y^2-\frac{1}{3}x^2y^2$
$\left(5x^2+7\right)+\left(x^2+2x-8\right)$
$\int5\ln4xdx$
$\left(4ab^2+6xy^3\right)^2\:\left(4ab^2+6xy3\right)$
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