$\left(u+\frac{2}{3}\right)\left(u+\frac{2}{7}y\right)$
$x^3+y^3=3xy^2y'\left(x\right)$
$\frac{1-\sin^2\left(x\right)}{\sec\left(x\right)}$
$x-3>2-x$
$\frac{dx}{dy}+2x=20$
$\frac{2}{x}.\:\frac{5}{y}$
$\frac{2}{t}=\frac{t}{5t-12}$
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