$750\:+\:650\:\:+\:540\:+\:650$
$x\frac{dy}{dx}-y=2x^3y$
$800-50$
$1\cdot10^{9}s$
$3^x=-\frac{1}{3}$
$x^2-3x-54=0$
$2x+4x+-7x$
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