$\frac{dx}{dy}+\frac{2x}{y}=4y$
$49a\:^2+112a+64$
$9x^2-42x-441$
$2\sqrt{25}$
$7\cdot x-1>-7$
$\left(x^2+16\right)dy=\left(2xy+24x\right)dx$
$5x^2+340x-1428=0$
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